Ranking risks from more to less likely,

1. An expected development of this sort of political message is blocking access to the tool's website to users from some countries, either by the website owners or by the relevant authorities.

2. Wiping people's files as part of open-source-as-political-message is less common, but not unheard of: https://www.bleepingcomputer.com/news/security/big-sabotage-...

3. Using or even advertising Notepad++ in Russia is probably not dangerous yet. Don't know about China.

No, it has had political statements for like a decade at least.

No, in the software itself he put political messages. There was a bunch of anti-China ones (for Uyghurs, Taiwan, Hong Kong), for Snowden, and for support to Charlie Hebdo after the terror attack. In some cases it opened a new document with the message for example.

I probably wouldn’t have put the messages in a document, but I support this