Things that get removed by staff on nexusmods don’t show a ‘Not Found’ link or have the title renamed ‘DELETED’ - they generally show ‘removed by staff’ or ‘under moderation review since <date>’.

‘Not found’ is usually when the mod author unpublishes a mod.

This sounds like the typical mod drama, author has removed it for some reason and people are jumping to conclusions and/or the author is gaslighting people into the wrong conclusions.