What do you mean? It's a direct quote from the page.

Fuchsia is meant to be used in variety of contexts like IoT [sic], and embedded stuff, Many time Go doesn't play well in such areas.

People coming from language like C++ and senior enough to write OSes may be startled how inexpressive Go is.

Even Java that started as a blue collar language, or modern Basic dialects that started as introduction to programming, are more expressive than Go will ever be.

On the same line they mention memory / cpu usage, I don't read it as we had bad experience using the language but more than Go doesn't suit well xyz because of memory usage.

Hence the word implementation accompanying experience, which was not omitted in the citation you're responding to.

Why can’t it be both?