The universes destroyed by Zeno should be the original Universes 7-12.

Assuming the original 18 Universes worked like the current ones explained by Whis, then Universes that add up to 19 would be the ones that are mirrors of each other. Because they still act the same even AFTER the destruction of 6 Universes, then I conclude that the universes destroyed were 7-12. Universes 13-18 were renamed and pushed down 6 numbers to align with the new amount of Universes.'

idk if the way i worded this makes sense lul