When I see politics in software updates or documentation, nothing happens because I'm not looking to use the software for political activism. Maybe I tell my adblocker to remove the messaging, and carry on with my task.
I can engage with politics in a social context, when political messaging isn't interrupting something else I'm doing; that's a better place for activism, IMHO.
I almost always see activists using the argument that if I don't like the messaging then I'm part of the problem. Somehow I doubt that, given I don't mind messaging at all, where it's appropriate.
So, while I fully agree with your stance that banning political discourse is support for the status quo, I also think that it's reasonable to ask for it to be toned down a bit, especially when the politics and social issues of one country is basically drowning out everything else.
All that said, I'm talking mostly about HN or other community forums here. The owner of Notepad++ has the right to put whatever they want into their software, and if we're discussing that here on HN then it's an occasion where discussing politics is valid.
Try to point out to a democrat that Trump is doing something right or to a Trump voter that Biden did something right. Most of them can’t accept that. The “other” side has to all bad. I don’t see this to such an extreme in other countries I know like Germany or Spain.