XTR, I think their point is that this is a bad flop to rep any kind of hand and most half-decent regs aren't giving up in this spot (if they had air they would simply b/fold it). This is usually something like JJ/QQ that is trying to get to showdown a bit cheaper but is never just c/folding here since you have very few Ks in your range. On the river I think he can show up with AA + random nl 50 stuff like AQ/AJ/AK enough that it's a call. We're obviously not thrilled about it though.