My main point is that the number of prospects hasn't actually changed much. What changed is what the Belarusians did with their junior players:
a) they were sent to North America
b) they now have an all-junior team in their men's league, both U20 and U18 (Div1 and Div2)
What this does is creates the illusion that their entire programme has become more effective, because their national junior team plays together the entire season, which is obviously a huge bonus over all the other teams, which are assembled from a bunch of different teams and come together shortly before the tournament.
While sending a bunch of their kids to North America somehow creates the illusion that now they have magically started to pump out talent out of their system. That's simply not the case. Those same players would be playing for Belarusian teams if that decision had not been made. It's just that those same pieces were moved to a different place on the board, that's all. The number of pieces hasn't changed.
Nothing much has changed. The Belarusian league is not good enough and not competitive enough to produce talent domestically like Switzerland or Finland does. The Belarusians are way, way too isolated internationally to do what Latvia does by sending a bunch of their most talented kids to the best European hockey systems. That's when you can say 'they're bound to produce some elite pros'.
The Belarusians aren't bound to produce anything. I don't see any upwards trend here.
You were right previously, I don't value CHL highly at all as a developmental league. But the fact is that more often than not Belarus kids that go through CHL actually become pro players and national team players in future, kids staying in Novopolotsk does not. Again, by sheer volume they are bound to produce more pros capable of playing modern hockey.
Small correction there is no U20 team anymore, there is U18 and U17 teams playing in what effectively is second and third tier of their hockey pyramid. Also you stubbornly chose to ignore that kids from these ''artificially boosted teams" how you pretty much put it now get drafted in larger quantities than stay 5-10 years ago. This year again minimum 3 kids are getting drafted, I understand that by itself it means nothing if they bust soon enough, but NHL scouts agree that there is something worth drafting which previously wasn't the case.
What you also fail to see is the geography where these kids are coming from, essentially all their hockey historically always have been Minsk centric with Grodno and later Novopolotsk chipping in a tiny bit. Nowadays due to arena boom of 00's talent is pulled out of places where it has never happened before. Again, increasing the pool and odds of getting lucky.
And lastly Belarussians are no longer foreigners in Russia. This is simply huge - less talent will trade their passports for advancing their future careers. Players like Kodola and Shostak comitting means a lot, same happens at kids level when Golubovich, one of SKA's U17 team leaders joined the team recently. So many players like Kabush, Zhuk, Petkov and previously mentioned senior debutants never played for them before which is a huge loss to smaller nation.
To sum it up, I never said Belarus is the next big thing or anything, but they are not future yo-yo team between elite and 1A. But you are wrong saying there are no good things happening in Belarussian hockey, their incompetent leadership might screw it all up like we see in this tournament, but their foundations and near future prospects look better than ever.