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.
For one, Gogeta no-sells Vegetto's entire existence by standing near him. Even if you want to use DBH (which you shouldn't because this isn't DBH), Vegetto Blue got handled by Kanba who you put beneath Gogeta. Honestly, you'd be better off saying Gogeta > Kefla, then you'd actually have a legitimate argument.
Two, Kefla one-shots Merged Zamasu without even trying. Kefla > Goku on his second omen of Ultra Instinct. Goku's second Omen surpasses his first Omen that matched Jiren, who was stated to be the strongest opponent the cast ever faced. That means Kefla >>> UIO2 Goku > UIO1 Goku = Suppressed Jiren > Infinite Zamasu. And before you try to bring up DBH, not only is DBH not canon and these profiles are both based on DBS, but the powerscaling even within that series is inconsistent as hell.
Three, Vegetto is so much weaker than a majority of the ToP cast at this point. I could easily argue that Caulifla and Kale individually surpassed Vegetto, let alone Kefla who easily is beyond him.