I also found the author's conduct shocking, people's memories are fickle and making this implication once was bad enough, but insisting on repeating it? Feels like the author _wants_ people to misremember and erroneously believe that Notepad++ was the software package in question.
I don't honestly remember, but, did none of the author's vicious attacks and bitter diatribes posted online over the years include some slander?
The notepad++ guy comes across as a dingbat who cares about certain political things more than the software he's producing. This is a risk indicator. It doesn't matter if you agree with his current views or not. What happens when he takes the next step in using the software he's created to further his political ends?
The author is right to prepare for this possibility.
I'll be sure to pass this valuable message along to vim users that have been :q'ing political messages for the past 15+ years. They're gravely endangered!