I always assumed it didn't count (shows how well I read the rules) so I've been posting some data dumps and some testing garbage there thinking I wouldn't get paid for it.
DarkStar_, if you want to deduct those posts from my next payout - feel free.
I assumed they didn't count too, and habitually excluded them when post counting. My guess is that 99% of all Archival posts wouldn't be considered due to other rules anyway, so it shouldn't really make a difference. I don't think there's anyone who actively posts constructive posts in Archival.