Flawed logic, though. Lower Decks isn’t saying that the Discovery Klingons only exist in a different universe, but that there is a different continuity wherein that variety of Klingons still existed at that time. There was another Klingon ship that just turned into a seafaring ship, presumably for another universe where the Klingons never discovered space travel.

The Cerritos ends up turning into a variety of different ships which obviously still exist in the normal canon, so there’s no continuity exclusivity with all these outcomes.