From that post, you can't conclude that pg "monitors the voting records" as a general practice, only that he's willing to look at them when someone specifically complains about the ranking algorithm. Read the parent comment to that one -- the guy complained about what type of stories were on the front page; pg made the point that the complainer wasn't doing his part to get other stories up there.
I don't think that Mahmuds' point was about the ranking algorithm, it was about the submissions themselves. As I pointed out in that other thread the fact that he didn't vote for those stories was his whole point, to quote his voting record back in public to chew him out is imo really below the belt and was - at least to me - totally unexpected.