This is a good detail considering the fight against Broly ... the first time around against Broly. The manga might have skipped the events of Dragon Ball Super: Broly for brevity’s sake, but ...
My only real criticism at this point is that after this solid narrative starting setup, we have a pretty hefty time jump to where we are post-Dragon Ball Super ... wants Broly to fight Vegeta ...
Goku doesn't know this, but it makes thematic and narrative sense that fighting against Broly ... scene collapses. If Goku has already called himself "Kakarot" before the events of Dragon Ball ...
These non-canon Dragon Ball films have quite a few interesting elements that should be brought back into the mainstream series.