This is not about old and new. If you were around late last evening, you would've known.
The Mods are being quite indiscriminate about deleting comments and entire threads. There were points of time when people were addressing comments to another user while the latter's posts had already vanished! Me and mie included.

A pity, if you ask me, because there were a couple of really fun threads on, where everyone was having a good laugh. And there were several 'old' QL-ers on, too.
And it was my first time spending almost an entire evening on QL, but... :( Well, it was great fun while it lasted.
Sigh, had never notched up so many points in one day, either ;)

I may not agree with their (cited) reasons for all the rampant deletion, but I can say that they were not discriminating between users.

At least, not from what I saw.