The original toplevel comment was about making a new compiler, not a derivative of an existing one, the comment you reply to is a continuation of that discussio

The original toplevel comment was about making a new compiler, not a derivative of an existing one, the comment you reply to is a continuation of that discussion not a standalone comment. The implication here is that the open source license is about a specific implementation and only covers that implementation but it doesn't cover its name, as you rightfully point out. Munificent wrote that the open source license protects you if you decide to create your own Go compiler and name using a derivative of the Go name, but this is wrong since the open source license does not cover the name.