Were the bulk of the bugs patched up?

Had few issues when playing it, I'd say so.

I don't remember AP being buggy, might be because I bought it a while after release but I only experienced 2 bugs (an enemy in god mode and a not accessible hacking point) but nothing really bad.

It still has some bugs, varying from annoying to amusing. There's one bug that may be critical to actually advancing for some- there's a forced close quarters combat where the enemies disappear on reload, if you don't have any CQC skills you'd be stuck otherwise. There's multiple enemy disappearing on reload bugs, and one where you start the level in cover but if you reload you don't so a stealth approach is instantly blown. Even after patching it's certainly in the flawed gem category rather than in the bug free and polished one.

In terms of sales, as has been pointed out the original quote is steam only, and only steam had steam keys so it isn't even all PC sales; other etailers and retail isn't counted. OTOH, the 700k console figure from Sega was shipped copies, ie copies sent to stores, not copies sold to the end user. They're not much use for telling actual sales as there might be additional shipments or alternatively they may sit around in inventory or be returned instead of sold. It's usually a measure of expected sales more than anything.