I don't know what powers need to be sourced when I literally added like 5 gameplays on the profiles/blogs. Also, all those are basic Godzilla and Mechagodzilla's hax, nothing off the charts, tbh. You don't see Godzilla/Mechagodzilla using Reality Warping or Concepts Manipulation. I have seen many profiles with no sources in their abilities, and they weren't deleted (Most of the wiki).
If the makers said Mazinger is Planet level in his bio, how is that wrong in the blog? Godzilla scales from Mazinger, and even if he doesn't have a profile, it can be used as scaling. Also, the Kiryu movies are canon to the game, so it can also be used as scaling too. See? There are many options, like explosion calcs, GPE, scaling, etc.
Yeah, let's ignore the videos, blogs, scans, etc., and also not everything has to be sourced, though. Why do Natural Weaponry, Large Size, Energy projection, Radiation, among others, need to be sourced? Those are cases of extremely blatant, self-evident powers and abilities. Without counting again that the Godzilla movies are canon to this game, so...