There's no point in overhead of repeatedly trolling and processing out stale archives when you can get valuable live bodies delivered instantly to your parsers for far less cost and work.
There are probably spam subs in Colin's list too, he didn't say which list, what exactly "closed" means, what subcount there is going back to when, etc.
Remote clouds and rspamd have learned them already since a while, faster, before they get shutdown.
Spooks are harder to kill than a little spam, work on those ;)