This is somewhat inaccurate if we go off a
Saikyo Jump statement that exist specifically for the manga version of Broly. In the lower right corner it states this:
"When he awakens to the power of a Full Power Super Saiyan, he fights evenly against Gogeta and others, but his rage causes him to lose control, making it easy to forget his true potential. If he can control his emotions and keep calm, he’s sure to win!!"
For context this has nothing to do with the movie when it released. This article came out during the Granolah Saga after Ultra Ego debuted and
features it when discussing possible routes Broly could take. According to it Broly, at least in the manga, is equivalent to Gogeta Blue but lacks control over his emotions. Which means he doesn't use his power properly and fights sloppily. So Gogeta didn't stomp Broly with power. He stomped Broly with superior skill and calmer judgement.