Yes thats true, but I don't think Oda will kill them off still.
Granted he still did kill off a good few people at Wano surprisingly too BUT he also made an absolute mockery of death during and before it too.
Even now I'm skeptical that Pythagoras and Shaka are even dead too, but we'll see. Oda did say"I hope no one dies" during his comments about the final saga and the upcoming "battle royale" but I sincerely doubt he's gonna kill off Kidd and co here.
We could find out in future they drowned and thats it, but if so, that would be immensely surprising imo. If they do die though, this could be the first case of Oda showing DF users drowning to death but I seriously doubt Shanks and co won't rescue them and force them to try to be better and redeem themselves as "payback" for saving their lives and being spared in the first place.
We've yet to see someone die from eating more than 1 DF too so far.
Shanks has just destroyed their ship, well Dorry and Broggy did too, so Kidd losing his only memento of his beloved childhood friend and crush might be what finally wakes him up and humbles him to be better and change too. If not now, not ever then. He's extremely lucky his crew are not all dead and thus wiped out like Moria's was.
Its all convenient that this happens just before a break too, so we're gonna agonise over what happened here too, well us Kidd fans will especially I mean ofc lol but the question of whether Oda will really kill off Kidd and his crew here or nor too. Knowing Oda, hes gonna cut back to Egghead or somewhere else at least and we're not gonna find out for ages either.