1. We don't need to get a ton of folds given that we're investing little to win a lot.
2. Villain should still have stuff like 88/86s/97s that are in a tough spot.
3. Villain may think that since you're shoving so little that it cannot be a bluff. :)

if your not sure about it dont do it, ezpz

I wouldn't even 3bet those type of hands. You aren't making money with those 3bets unless villain is over folding vs 3bets.
I know solver is doing it, but nevertheless it is quite unnecessarily