No, it’s NOT possible this is a term of endearment....I assume you were being sarcastic.
As for Luntz, like all focus group mavens, he’s right...for the moment. Right now, nothing does disqualify Trump. What focus groups do not take into account, because they CANNOT take into account, is the impact over time and the critical mass issue.
On the other hand, Bill Clinton over whelmed the critical mass dynamic by having a CRITICAL critical mass - where there were so many problems, no one could remember or focus on a single one. Perhaps Donald will do that.