He genuinely doesn't trust people not to go archive-digging to drag shit up on others, especially those waiting in the wings who no longer play/like Neb and would throw it around Discord or whatever.
The archives represent a drastically different time in most cases and anyone poking their heads in who goes digging is probably going to get a negative impression. He doesn't want that, with Neb moving into a new era and away from Gmod.
While arbitrary, I'll bite
Both of these issues are core issues with Nebulous and not something to be avoided by locking every piece of writing behind locked doors.
someone from a circlejerk called us (the hl2rp staff team) child rapists, and that it is an issue for him to play when we are such vile things that he described us as.
Sure, you can avoid this to some extent by just not giving them more ammo (albeit i do not know who has the mental fortitude to sift through thousands of pages of forum posts to find some words by a user to laugh at them in a private discord), but to be honest this is not treating the root cause this is treating a symptom. if someone wanted to begin a defamation or derailment campaign on me, they would not need the archives to do so and would just make shit up/bring shit up from my past i mentioned happened and that i cringe of, god knows there's plenty of those moments.
the people who fling shit at neb will continue to do so regardless of if we open the archives or not and i feel as if this preconception of people being unable to fling shit at someone or neb because the archives are locked is one that should not exist because it is simply untrue.
now for the bad image on nebulous - members who join and who are worth impressing are the ones who will garner their first impressions from ingame and not from the forums. people who fling shit at nebulous will continue to do so and will in turn infer a bad image of the community regardless of if the archives exist.