Not sure if it's related, but you can have a good Tactics Trainer score while having a terrible passed/failed percentage. While terrible passed/failed percentages in real games probably won't result in a good game score.
On the other hand, the passed/failed percentage is much more important at slow time controls than blitz of course.
That Tactic Trainer here is very likely flawed. I have seen many 1500-1600 players but having 2300-2500+ rating on the Tactic Trainer here. And one guy here with a Blitz of 1200-something has a TT rating of 3800....
I think he has "hacked" the system in some way or receives help from someone with an engine.