The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
He has the power of All Creation (that's btw the literal meaning of Shinra Banshou) and transcends all concepts, just like God.
There are several other good YT videos which also scale Shinra to Outer, some of which even suggest that Shinra IS The STRONGEST Character in Anime
(which not even I can agree with, although I like the FF series very much. But it's true that Shinrabanshoman is definitely very, very high up in the ranking of all powerful anime characters, likely ~ Top 10).