Based on the article, his critique and analysis of in-game NFT usage was pretty shallow and not very technical. I think there would be many ways to synchronize blockchain NFTs into game items, make them disappear from the game (with some delay) when the NFT is transferred to someone else, etc. I can imagine there would be many practical problems to solve, but real critique should be based on how someone actually tried to implement all this and failed. Otherwise it's really just an imaginary strawman argument.