It's mostly a troll cover page
Knowing Moria who's pretty smart and likely to manipulate ppl, very fitting to name himself part of Kozuki clan inorder to let Wano ppl believe and support him, and even hailed him as a hero lol.
It will also make Robin look worse and worse when we believe she's the only key to obtain one piece due to his role as a Poneglyph reader for decades. Pudding, Oden's father, Momo....Ok, and now Moria too?? The most random thing ever 🤣
Tho I won't underestimate Oda forced writing these days, it could be real too, as it seems Gecko in reverse means Kozuki in Japanese, that could be some interesting buildup