You can say the same thing about any prospect. There are always questions about whether any prospect can bring his game to the next level, be it CHL, Euro Juniors, NCAA, AHL, SHL, KHL, etc. A CHL player will never be able to play NCAA due to eligibility, so that point is moot.
Heidt is scoring at a ridiculously high level for a D+1 player, and it's not like he has any size, strength, or skating issues. If you look at his on ice awareness, he has MiG/Rossi levels of vision. Always seems to know where his wingers are, and is able to find him. Funk is feasting on playing with him, as is Perascak. He can easily end up being 6', 190- he's 5'11' 180+ right now. He's outscoring Nic Petan by a good margin when he had his great D+1 WHL season, while being significantly bigger, and has a 57% FO to boot.