They didn't say "fork of Electron", rather Electron is essentially "Chromium - browser UI" so they are saying there is a simplification to be made in an app that is "Chromium - browser UI + browser UI"
Flagging that the phrase "this should be a fork of Chromium, not Electron" is ambiguous between "this shouldn't be a fork of Electron" and "this shouldn't be Electron".
The phrasing is ambiguous, I agree. However, as forking Electron to make Min wouldn't make any sense, and the replier knew this, reading it to mean that seems like a mistake to me. The fact is that it can be very difficult to write things that aren't ambiguous at some level (albeit that isn't the case here), so the reader has to make a good-faith effort to understand.