If I remember correctly, it’s been said that some mangaka have a couple chapters prepared in advance. Is this true?
I seem to recall Oda doing this in the past, and it’s also why chapter leaks have happened before. (EX. Chainsaw Man had a couple of its chapters leaked on 4chan a few months ago.)
Oda just had his surgery not too long ago, so I wouldn’t be surprised if he’s drawing and publishing the chapters within the same week.