Wait, what? Did the ban notice change or am I just imagining things? I don't think it used to say anything about plagiarism.
...
Something has happened, but I don't really want to try it out with my own account, if there's a new ban notice or not

Yes.
This is the new message for when you get an autoban:
Sorry XXXXX, you are banned from posting or sending personal messages on this forum.
You have been permanently banned by a forum moderator,
probably due to spam or plagiarism. You may appeal here, but your chances are not good:
banappeals...@theymos.e4ward.comNotice the "probably due to spam or plagiarism" part. That's the big difference.
Source:
my alt got banned i'm just kidding, no bannerino pls. This post:
https://bitcointalk.org/index.php?topic=5083458