Can Tryndamere not be allowed to ult during the GA animation?

What are you asking? That if you spam ult it dont go until after you revive?

I've played a lot of tryndamere and have a decent win rate. From what I gather you are ulting right as you are going to die, and the issue is there is a very small delay between pressing r and becoming immune to death that you are failing to meet. You need to press R before the damage that would kill you hits you, then it won't pop GA and your ult at the same time.