That link admits that the compiler performance was lower than needed in Go1.18 and Go1.19, because of generics, even when compiling Go code without generics. I can confirm this based on my own open source projects written in Go [1].
The irony is that vocal minority still do not use Go, since they have other excuses now - "bad error handling", "missing functional features", etc. But if these harmful features will be implemented in Go, the vocal minority will find another reason why they do not use Go.