There was a gap but 2x seems kinda too much. That is legit one shot territory.Probably 2x or something. He had to have an increase from his base power which was already quite inferior to Goku's base, to a level which absolutely humiliated Goku's SSJB.
You could argue it was 2x, because Golden form is such a worthless form that almost immediately afterwards it was growing weaker.There was a gap but 2x seems kinda too much. That is legit one shot territory.
Even 20% is total stomp. And Afaik goku could fight back and hold his own