At 80+Gb that means it’s a straight blu-ray rip without being recompressed at all, which is perfect if you have a nice home theater system. You definitely notice the difference then. But if you’re just watching on an average monitor with headphones or such, then you’re honestly better off finding a smaller version that someone properly compressed down a bit.
Alyx came out 4 years ago, and is recognized as one of the best VR titles of all time. It’s a full 15 hour game, so not a tech demo. I’d say that’s a hit.