The Universal Goku thing is explained like this...
A. They were going to destroy the universe with the shockwaves of their clash alone, in a quantifiable amount of time— 3 blows. Again, it was the Shockwaves that were going to destroy the Universe. Wave your hand like a fan, or clap next to your ear. Try to feel the air pressure from that. Now, recognize that, if you were between those clapped hands of yours, or you were touching your waving hand, you would be putting our far more force than just a breeze. If the shockwaves were gonna destroy the universe, how would their AP do against someone with 3-A durability?
B. The physics of the shockwaves aren't really a good topic, because you also can't... Cancel out shockwaves caused by two objects crashing by hitting them with equal force, I think. Even though that clash is what was causing the shockwaves in the first place... So if you're gonna nitpick that, we can nitpick all of fiction, because even swinging around a buster sword would be impossible without it dragging you around instead of you using it with no effort. Balance and such. Hell, they never do this universe shaking stuff again, so...
C. There's also that Kamehameha clash with Beerus that was going to destroy the universe too. So, even without the strikes, Goku is universal via Kamehameha. And he got stronger over the course of the fight.
D. The narrator said that they were hitting each other with power capable of destroying the universe over and over again. That's a whole statement.
Now for the OP.
Ummm... Which version? The initial boost, or the reuse of the form in the Tournament of power?