And if that's true, which likely it is.
All the gods lose their ratings. Buuuuut, goku when he transformed into ssb infront of the gods, the sub states "that his power rivals the gods". It could mean that he rivals the kaioshen, but they already been surpassed.
You could say that they stated to mean that he has the energy of the gods, but he already has god ki in his base so....which leaves us that goku in ssb rivals the gods so take it as you will.
Toppo is the candidate for being the god of destruction for U11, they wouldn't choose him if he wasn't at the very least comparable to belmod, and it would actually be very consistent with jiren stated to be above the gods and above his own god of destruction.
We know that belmod is stronger than beerus, but beerus states he only lost in arm wrestling, making belmod at the very least comparable to beerus.
Toppo would still scale to Half 2-C , reasons: he would keep his old rating with " possibly half 2-C for being the candidate to U11, which has a GoD physically superior to Beerus."
Belmod wouldn't choose toppo as a candidate if he wasn't capable, and skillfull or has enough requirements to trust toppo and pass him the mantle of being a God of Destruction