I guess he had his reasons to leave,but deleting his threads is not cool;it's like burying a treasure trove and throwing the map away.
Saying that,is there a way that you can download an offline copy of perlmonks, like the way you do with Wikipedia?
Something like this would certainly be a solution to this kind of problem.
Then having got an offline copy, aside for disaster recovery, could also be handy in some occasions.