This isn't even trolling, comments from this guy are genuinely sad.
He can't even control himself to be believable, he can't even control himself from writing blatant lies (he said that Croatian club Sisak will not only be bankrupt in couple of days, but that it was also already announced on local media - both of which never happened).
I also have a hunch that he's the sone guy that is writing insults in comments of livestreams of Croatian games in IIHF worlds every years.
All in all, it seems that it is something deeper and not humerous.
So, it has nothing to do with Idžan, as I'm sure that he would say the same for any Croatian player in same situation. I would bet that he was also saying that Rendulić would never be a pro, let alone in NHL and KHL.