He didn't say anything about 'only server side stuff'. There is plenty that has already been demonstrated with webasm - video editing and filtering, audio editing and filtering, advanced computer graphics, direct porting of games, etc.
Even for that it doesn't work without some js. The promise was that you can use your favorite language for web development and that's not the case. WASM is now more about the integration with JS.
> The promise was that you can use your favorite language for web development
I can see where you are confused. The promise was never about using your favorite language for web development. It was about being able to compile languages to a synthetic ISA that will run at near native speeds.
> WASM is now more about the integration with JS.
It was never about getting away from javascript, it was always about being able to run software at near native CPU speeds in the browser.