I'm not sure that the first one is a bot, probably a non-native speaker that use weird constructions. [Hi from Argentina!]

I don't think the second is a bot neither, just someone I disagree in many comments.

Looking at both comments histories, I'd expect that normal users will flag many of those comments, without the necessity of bots.

I guess account with too many negative of flagged post are highlighted to review by dang/tomhow but send an email to them so they can take a look.