There’s a simple test: Rotated the front tires side to side.
If the pull completely changes direction, the problem is 1`00% tires.
If the problem doesn’t chnage at all, the problem is 100% the vehicle.
If the pull changes (other than completely changes direction), especially if it disappears, then the problem is both tires and vehicle.
From what you have said, the problem is in the vehicle and it’s probably something other than alignment - like a dragging brake.