However, Lauda asked theymos to ban his account before he left the forum, so it's possible for admins to do it if you ask them in personal messages (not guaranteed they will do it).
Making your old accounts inactive is also fine, and you don't need to do anything, except maybe posting with your main account about your decision.
Yeah i also see two cases only on the forum one you have mentioned about @Lauda to ban his account and other of @satoshi that @theymos himself has locked out to avoid any problems as we all know many try to be one's they are not.
So it's best not to use them and tell others about it because I don't think @theymos will dig deep into the matter so you can try the above mentioned ways or not login using the same account of yours.
Yeah can't find the old cell so I can't access that one.
and the vacation on is not in use for a really long time.
I guess I will mark them with neutrals and tell everyone they are no longer in use.
Yeah that will serve the purpose on the basic lines as if someone gain access to these accounts they can ruin your name so it's better to tag them if you are not having access to your account or can contact @theymos for permanently banning them.
By marking others will also be aware about it and nobody can have bad access to it.