Depends on the community. From my experience, the modding scenes for certain more recent games seem abivalent about it, or more willing to tolerate it, while the communities for modding older games tend to be more heavily against it.

For example, when a Paper Mario decomp/port used AI, the subreddit for the series pretty much tore it to shreds for that. Mario fan communities in general tend to be really heavily against it, with Mario Fan Games Galaxy, SMW Central, and SMBX having rules which are basically "no AI allowed for submissions ever".

Meanwhile my experience on sites like ROM Hacking.net is that AI is more accepted/tolerated there.

So, it's very much a series by series thing. Best to check what the Mega Man community thinks of LLMs before you post it.