Yeah, it would seem that JS can be sufficiently obfuscated already.

Well, someone went to the trouble of writing a Rust binary just to hide the game code, when they could have used standard JS obfuscation instead. This suggests to me that WASM has some properties that make reverse-engeneering harder than obfuscated JS could do alone.

This would give some validity to the fears of WASM becoming the "new Flash" that were voiced when it was still in development.