There is no such thing as hot or lukewarm, it's a cognitive bias.
Goalies aren't playing subpar games due to having bad days. The days aren't bad, it's basic statistical variance due to the stochastic nature of hockey.
Once the sample size is big enough, it's possible to establish a baseline for every goalie. Lubys is too young for that, but his stats are below average within the league he's playing in.
Goalies on bad teams don't get worse stats, unless those teams are like a couple of deviations worse, but that is very rarely the case in hockey leagues.
And, yes, there's a ceiling for short goalies. You can't be an elite-level NHL goalie if you're 170 cm tall. You have to be better at everything else if you're handicapped height/wingspan-wise. Since Lubys is not showing elite stats for his age, it's quite possible he's never going to play major pro hockey.
Armalis is an average SHL-level goalie, which is really good for this level of hockey.
Jesus.. Well, you are the same guy who tried to prove Girgensons is a legitimate candidate for Calder, not much has changed.
So:
1) "There is no such thing as hot or lukewarm, it's a cognitive bias." - That is flat out wrong and only a person who hasn't done any serious competitive sports can say that. Form fluctuates and it depends on many factors: your physical shape, mindset, confidence, etc. "Hot" is the definition of the goalie being in peak conditions. It's extremely important for people in that position because mental part of the game is so big. Losing confidence will lead you to overplaying, taking unnecessary risks, etc. I mean seriously, whatever it is you do in life, you don't feel you can do the same task better for a period of time compared to the overall body of work? Hell, even someone who plays computer games at above casual level knows it perfectly well. Confidence, mental fatigue etc. are very real factors not to mention the physical part which is flat out obvious in sports.
2) "Goalies aren't playing subpar games due to having bad days. The days aren't bad, it's basic statistical variance due to the stochastic nature of hockey." - You have never had one of those days where you can't do anything right? When you can't make the right decision, fight the puck all the time, etc. Again, you are talking like someone who doesn't have real world experience in any of this. Furthermore, someone who follows hockey at least a bit knows you are wrong. Watch the first 3-4 games of Sharks vs. Vegas series, watch Martin Jones play like absolute garbage. Legitimately playing at the level of ECHL goalie. So you are saying it wasn't up to him to play well? He was as good as always only happened to play like trash? How does it work?
3) "Goalies on bad teams don't get worse stats, unless those teams are like a couple of deviations worse, but that is very rarely the case in hockey leagues." - yes but goalies on the good teams as a rule of thumb have better ones. Saying Lubys played on a bad team just illustrated the fact his chances to pad his stats were very limited. I mean Vladislav Okoryak, the guy who almost cost absolutely stacked Loko team the title, had .952 Sv% in the playoffs. By your logic he's all bees knees but that stat line isn't worth anything. In any case, only 12 goalies with 15+ games managed to get .900+ Sv% in Finnish U20. Lubys performed
slightly below league average being 2 years underage.
4) "Since Lubys is not showing elite stats for his age" - again, absolutely loving you choose to use the stats of him playing in U20 as a 17 y.o. but continuously refuse to pay attention to stats of him playing closer to his age group - U18 at 16 - where he was great.
5) "Since Lubys is not showing elite stats for his age, it's quite possible he's never going to play major pro hockey." - What does that mean? He isn't going to play in the NHL? Sure. But all the signs seem to point he will easily have a career in Euro leagues.
At the end of the day, you ignore common sense for the sake of not having "cognitive bias". And it creates the situation where Zemgus Girgensons becomes a legitimate candidate for Calder trophy while the guy who is obviously doing very well for his age somehow becomes bad because he can't dominate against 2-3 years older competition.
Armalis himself is sort of another great proof of this. Show me the stat-line from his junior career which would have lead you to believe he ever becomes an SHL starter. His first modest success, stat-wise, was that season for Tranas at the age of 20. At Swedish 3rd division.
At junior level, very little is in the stats aside from the can't miss top talent. And even more so when it comes to goalies. Meanwhile in the real world, Lubys has dominated every freaking international tournament he has played in. Which is kinda hard to miss.