Shouldn't Saitama AP on the Sandbox read:
Attack Potency: Multi-Solar System level (Provided half of the strength contained in Serious Punch2, which
annihilated millions of stars.
Drew blood from
Awakened Garou[2]) likely
far higher (
Exploded in power while fighting with
Awakened Garou: Mode Saitama, surpassing and
eventually stopping him, vastly outpacing his reactive evolution and power mimicry in the process with the narrator stating that there was no longer anybody left to measure what level his strength had reached
[3]. After defeating Garou, he sent his fist back in time and
one-shot[3] him before the fight even began).
Higher via Accelerated Development (Saitama passively grows in strength and can
one-shot himself from the previous day[5] effortlessly).
Maybe it could be worded a bit differently but what I mean with this is that it's made pretty clear that by the end of the fight Saitama's AP is far beyond the AP he demonstrated during the Serious Punch Squared.