It's not about the fact if Sanji used DJ or IJ. And since when post wano sanji DJ is weak ? Obviously Oda ain't giving the first L for the seraphim against someone like Sanji.
But the fact his main weapon (leg) got dislocated ... it's like zoro's swords got bended or luffy bleeding from fodders even if he is a rubber.. (oh nvm for luffy, that's always the case)