So, currently this upgrade would bring all the God-Tiers to "Possibly Low 2-C". I think we can all agree on that at this point. However, I think the "Possibly" tag deserves a bit more discussion.
First, let me just quickly elaborate that I'm not saying they should be definitively Low 2-C. There are still some small assumptions being made here and there that would make a definitive rating unreasonable.
However, I do still have a bit of a problem here. Going off of the page on Attack Potency, the "Possibly" tag defines when a character could be that tier, based off of evidence with a mostly inconclusive result (that is, it is considered reliable but still debatable). The problem I have here is that the Low 2-C feat here is hardly a heavily debatable one. Again, due to mild assumptions it can't exactly be considered definitive, but it entirely works as reliable evidence backed up quite nicely with various lore statements.
To better understand what I mean, let's take Bayonetta's character (which, yes, I'm aware her tier is getting revised soon). Currently, at her strongest she is considered "High 4-C, possibly far higher". The "Possibly far higher", going off of her profile, seems to be based on speculation that she could be comparable to Aesir, but without any solid backing. That's what would seemingly be considered evidence for a "Possibly" tag, and I'd argue that the evidence for this Low 2-C rating is far more solid than that.
In conclusion, I personally think that the justification provided here is much better evidence to suggest a "Likely Low 2-C" rating.