That's not even remotely equivalent. The only statements scaling Broly, Jiren and Goku is that they are equal to or stronger than Beerus. We have actual scaling and feats from Gogeta to ascertain that he easily defeated Broly, who scales to being equal to Beerus at worst.
Again: Gogeta > Casual Gogeta >> Broly >/= Beerus.
The gap is "Beerus + Champa = 2-C". Basically, anyone 2x Beerus would be liable for 2-C rating. Broly is equal to or stronger than Beerus. Gogeta casually curbstomped Broly. Gogeta's full strength is likely far greater than that. The only issue is that we don't know how much stronger Gogeta's serious power is, when compared to his casual power against Broly.
There are other arguments presented as well. Broly started out as much weaker than Base Vegeta but, within minutes, could stomp SSG Goku and SSG Vegeta in Wrath (only 10x base) and then grew stronger, becoming comparable to SSB Goku in just Wrath. Essentially, Broly has grown countless times stronger in just a few minutes of adapting to his opponents. When Broly went FPSS and started to overwhelm SS Gogeta, Gogeta opted to go straight to Blue and stomped Broly for the rest of the fight.
So, knowing Broly can adapt to stomping SSB-tiers around, from being stomped by a Base Vegeta, with just his Wrath form...and that Gogeta skipped to Blue from SS against FPSS Broly...we can ascertain that Broly, if the gap between he and Gogeta was lesser than 2x, would have likely grown strong enough to at least match SSB Gogeta.
There is no evidence that Broly stopped adapting. There is plenty of evidence that his peak was equal to Beerus at a minimum. There is evidence that Broly can adapt to people countless times his strength in mere minutes. Yet you would claim Gogeta is not at least 2x Broly, even though he casually stomped Broly, who was unable to adapt to Gogeta's casual strength?
Essentially speaking, there is no argument against Likely 2-C SSB Gogeta. I would genuinely argue that Gogeta should be straight up 2-C. The only reason I refrain from that is due to people already disagreeing with Likely 2-C Gogeta in the first place (despite having no arguments against it).