Well, as you said, Givony's mock draft has Kanter at #6 right now. All the buzz around the league, at least that which we're hearing, suggests that Kanter is definitely in play at #2 and would be a surprise to fall below #4. That wouldn't be a big deal in the middle of the draft, but when you have a guy who seems to be a clear top-4 talent dropping to 6, that raises some questions as to why.
Givony is apparently basing this decision on games that Kanter played two, maybe three years ago. Granted, we don't have a lot of tape of him since then, so there's not a lot for us as fans to go on. But Givony typically uses a lot of scout/GM feedback in creating his mocks. So either 1) the scout/GM feedback isn't what we're hearing in the public media, or 2) the scouts/GMs are lying to Givony "confidentially", or 3) Givony is going solo on this one and ignoring Kanter's apparent standing because of his own uncertainty.
It kind of looks, at least to a lot of fans, that #3 is the case. I'm not saying he has an agenda, but I do believe that Givony does have a history (as does pretty much everybody else) of losing objectivity for a small number of players and Kanter may be another. People have suggested he's anti-Kentucky or anti-Calipari (he was also not high on Evans) but I don't think this is necessarily the case. But I think it's at least reasonable to think that he might have lost a bit of objectivity as concerns Kanter. It's not a big deal, but it's unusual and so it sparks attention.