Well in the manga the fight lasted a whole two pages. Frost knocked Goku down and he smiled, hopped back up, stretched and said it woke him up and that he's a slow starter. Then he transforms to get Frost to show his true power.He also says the same thing in the anime. But he takes a direct hit from Frost, is knocked down, get's up easily stretching like nothing happened. Surprising Frost. Implying he's not trying much, only going SSJ to force him to transform. Which he directly said.
In the anime the end result is almost the same but the fight is shown to be much more in Frost's favour.
I'll put that aside though if the point they're trying to make is that Goku wasn't fighting seriously. If he were serious it's hard to say if he would have still been weaker, stronger or equal.
Even that translation implies the same thing. As a SSJB they say he surpassed SSJG. The narration in the anime also said that didn't it?I think you are checking wrong translations here. Herms translated it like this
If Goku was supposed to have just absorbed that power and he was supposed to be that strong anyway then why are they specifically separating SSJG from Goku's ordinary state? They should say that he surpassed his current state of he reached new heights or "a form surpassing Saiyan beyond God" etc.
Both versions are clearing separating normal Goku from Super Saiyan God.




