Nuts off
Hello,
I think these threads are right hand.
This is kind of like a "doble nut" sort of setup. I am guessing that the nut is to stop it from loosening. try to hold the wastegate end with a vise grip or something and loosen the nut the "regular way" (lefty loosie, righty tighty) I would try to do it off the car.
I have found when things are double nutted, it can be tough to crack it loose.
If you are doing it on the car, make sure you are doing it the right way, you would have to lossen the nut "down" which would be left if you were looking at it from the diaphragm side.
Hope I helped ya.
Bil