He's quitting when he "finds a replacement" and will still own the company and run the "software and servers" of the company. Yeah, that's not really quitting, that's getting a fall guy.
Elon will step down from Twitter as soon as Teslas are capable of full self-driving.
Question is, how much influence will be retain? Assuming this ever happens.
All of it, since he's the owner.
Ultimately any CEO just reports to him.
Why does that matter, he owns it. Why is everybody so emotionally invested in how much control Elon has over a website that he owns? There are a lot of websites.