Kind of just stands in contradiction to this entire point.
Because Murata said his opinions aren't reliable unless they're based on ONE's input.
So he's underestimating his strength that he's not really too surprised at the level of by a factor of 2000 to 13 million-fold?
Probably just refers to the fact that he's an alien conqueror, or literally anything else.
Also, it was unsealed Boros holding the Earth. Boros needs to release all his energy that far surpasses his most powerful form to potentially perform a
5-B attack.
Never happened canonically and the calculation of it was rejected. Speaking of which, the calculation was
High 6-A.
Even after they added a shockwave from another calculation, it was still over 120,000 times lower than
5-B.
A
High 6-A feat.
Apparently there's some Genos was weakened/we don't know BS' their size logic that even I don't agree with personally. The point is, we don't accept singular clones scaling to Genos, which I kind of also think is fair considering their performance against Metal Bat.
Also, the Genos that he fought is currently somewhere around 30 megatons without 10 second mode. So he's 1.682 petatons, or
High 6-A.
It was just calculated as
High 6-A.
Only Saitama has performed a Tier 5 feat right now, and it one-shot a character. Even this feat, casual as it is, was well over a thousand times lower than
5-B.
This isn't overhyping or joking about his strength, this is threatening to destroy the planet himself. Even Murata admitted this is utterly out of character in that statement you want to accept.
Aside from another databook for the manga calling it surface-wiping.
This guide was actually authored by ONE and Illustrated by Murata.
And we waited multitudes of chapters to do that, even if you don't include how long it took for the CRTs to get accepted.