Two things, first the teams selecting at the end of the first round, unless they are from a trade, are really good teams. Those teams are looking for a player to help get them over the hump, not a hope and a prayer. Also those teams didn't become good by wasting draft picks.
The second is this, they are saying he could be lottery by fixing a couple of issues. There is no guarantee that he does that, in which case you get a guy that you could select at any point in the second round without getting locked into a contract. Those issues that were previously listed included shooting, effort and feel for the game. Now maybe some team buys that he can fix his shooting, but without watching him play, there would be no evidence that the other issues were even being worked on.
But curiosity killed the cat on multiple occasions, so some team might be just curious enough to take him at the end of the first round. However, I bet curiosity will only move him a couple spots or so. Hard to be that curios when there is a lot of proven talent in the class. Remember, the NBA virtually has their pick of college basketball this year, as virtually everybody declared, and I bet most stay in.