Graphene actually is used in small amounts in a few places today. The difficulty is still in scaling up production.
I won't really know which computer storage technologies you're referring to. There are plenty of different ones, most of them just have niche applications or are too expensive to replace today's SSDs for general use, as SSD technology have gone a long way. It's a similar story to batteries, honestly. Lithium is still just the cheapest for what it does, but alternatives for niche applications exist.
Fusion needs more funding, no way around that, otherwise the theory is sound.
But of course, it is true there's tons of clickbait. But promising new developments do exist.
It's unlikely a lecturer will change the course material this quickly. There's a lot of planning and work that goes into a class. They probably will change strategy for the next semester, though.
In addition, game dev is game dev. The skills are 90% transferrable. A university class (should, at least) will teach you about the foundational and general concepts, using a game engine like unity to put theory into practice. Classes generally don't use and teach a tool to teach how to use that tool specifically, but to teach something more general/foundational, that will be useful in the future no matter how the tech landscape changes.