So basically goku already surpassed SSB all that time ago, making it even more worthless of a transformation.
If you can only access that much greater power in spurts or rare moments of desperation then that isn't properly surpassing anything. Even though I firmly believe the power displayed there was likely on another level from Super Saiyan Blue, Goku doesn't even understand how to release or use it whenever he wants.
With that said, so while Super Saiyan Blue may be weaker it's almost certainly a more reliable weapon in Goku's arsenal. Who knows, maybe once Goku uses the new power in these upcoming episodes and likely faints or becomes incapacitated he will have a much better understanding of how to utilize the power. I think what's going to take place is Toppo, Jiren will see how important it is to get rid of Goku before he releases that power again and that's when Universe 6 will likely end up coming to Goku's aide, paying back the debt they owe him from earlier in the tournament.
Where's the silver eyes then
It just seems like grasping at straws to make TOEI look like better writers than they actually are. When re-doing the BoG arc they probably didn't even have the framework for the U6 tournament finished.
They likely just didn't have that planned out yet. It isn't impossible that they had some kind of framework all along but decided later on the rest of the details. For example, Goku Black looked exactly like Goku up until he started using god ki in super saiyan rose, and then his eye color changed to grey. Goku's new eye color matches Black's eyes now apparently, possibly suggesting that Goku has now become a true god.