Looks to me they are attempting to retcon Beerus to be closer to angel level fighters. Beerus was originally portrayed as one shot material to Whis, but in the recent chapter it's mentioned that Whis is in constant ultra instinct state, which means he is always in ultra instinct mode.
On the other hand, they now claim that Beerus has a mode that if someone on Vegeta's level could learn, could allow him to surpass Goku's current UI level, a mode unknown to Vegeta, and thus suggesting it to be a technique increasing Beerus' base level.
If it's the case then, it could allow Beerus to turn out to be closer to angel level fighters than he originally appeared to be, in which case, Goku could probably not be able to beat him now. I guess it could also go in accordance to the oracle fish prediction about the time when he'd get rival(time that seems not to be the case now), as well as why plot had to move him away from planet Moro just the moment he finally decided to fight
So while it logically doesn't make sense that Goku didn't surpass him yet, the narrative seem to suggest that Beerus is still stronger