> "Woah, Rust helps so much that I can basically think 'if this compiles, everything will work', and most of the times it does!"

I think is is a fairly bad example to pick, because the fact that the person says “I can basically think” and “most of the time it does” (emphasis mine) shows that they don't actually believes it will makes bug-free programs.

They are just saying that “most of the time” the compiler is very very helpful (I agree with them on that).