Aside from some syntax around function prototypes, it's really not, unless you are counting "people tend to use certain things less often" as how you're counting that difference.
You seem to have a problem with the fact he criticises other languages. Would you also treat someone who isn't currently designing a language with the same harshness if they also criticised a language the way Jonathan Blow does?
His opinions and views on PL design are still up to scrutiny, so it's not a glass house like you claim. PL design is not compiler writing. You're free to implement all his ideas and write a Jai compiler yourself if you need a proper compiler in your hands to properly criticise the language.
And frankly, the only thing mentioned on this thread about "80% features" is not as controversial as you're making it. Nobody here is claiming it as revolutionary or game-changing, so even if you're right, your posts are a bit uncalled for.
Why do you think it's vaporware?