I appreciate that, but it cannot be a valid reason for being complacent.
And, by the way, I know many non-native speakers whose writing skills are amazing.
It's because they put the effort
I am not judging anybody, I was providing some genuine feedback. I respect that the guy is writing about JavaScript from Serbia. And I am one of the many people he can reach. So my two cents advice is too put more effort in his communication skills.