Of course they don't since you omitted first part of the sentence where I thought that was his only case of plagiarism in which case I wouldn't personally give anyone permanent but instead signature ban but then it was discovered that it wasn't the only case and he was doing it on the regular basis.

I belive that forum lost some good members by being too strict in the past and perma banning members for a single copied sentence but no one cared since numver of active users was on the rise. Now situation changed and they realised that wasn't the smart decision so forum staff become more lenient in that regard.