His passing stats suggest he's nowhere near that bad, I believe them above a horde of angry villa fans who will have fumed at every little mistake every player made and forgotten all the good stuff anyone did. Not that I blame them, it was a horror show, but they're bound to have a negative bias after the season they had.
Still assuming we'll get Carvalho, so this guy in worst case scenario would be because we're selling McCarthy and perhaps another of Cleverley/Barry. We'll have far too many CM's otherwise.
I wouldn't say it's bias, they watched him week in week out so know what he's good and bad at. Stats can distort anything, I'm sure I saw a stat saying Sakho had the best pass completion rate of any centre back at one point last season. If you went purely off stats you'd think he was Beckenbauer-esque ball playing defender