Since some campaigns don't have character minimums, if mods didn't delete such short posts as the one you mentioned, everyone in a sig campaign that didn't count characters would be posting "Nice!" or "+1" a hundred times per day.
I think that all reputable bitcoin campaigns have a 100-200 minimum character requirement for posts. I can't remember seeing one in the previous years without such requirements. When it comes to altcoin campaigns, I really wouldn't know.
I have another nick though I was doing an important work with, in fact it was receiving a lot of merits and people still wondering there why I'm not going on with that thread and I specifically stopped to posting there because of moderation (the posts that required hours and hours of research from my side were being deleted because someone was not happy to read the truth about how they crypto was launched, of course I was polite as ever publishing the info) and because it has become almost impossible to login using TOR (which of course is another matter).
If you have an alt-account whose posts are getting deleted, that's a completely different matter and an unrelated case to this one. The point of discussion here is the post "great" that got deleted, and everyone seems to agree that it was rightly so.
No one can comment on the deleted posts from your alt account because we haven't seen them, we don't know where they were posted, and so no one can comment on the possible reasons of deletion. Even though you say that your posts were truthful, that doesn't make them on-topic and relevant to the discussion, and can cause them to be deleted. You might have also posted your posts in self-moderated threads and had them deleted by the thread starters and not the mods.
As an example:
If there is a thread that discusses a recent cooperation between two altcoin projects and the implications the deal can have for the value of the coins, a truthful post from your side how altcoin project A is a scam for reasons A, B, and C, can be seen as off-topic and be deleted.
The better option for you would be to start your own thread in the Scam Accusation or Reputation board and explain why you think the project is fraudulent. That would then be a potentially valuable and on-topic discussion.