Egypt will still be on their side of the border. It’s INSIDE GAZA that they’re talking about. And between it being Hamas (which it has been all along) versus the Palestinian Authority, Egypt prefers the PA.
“...the Palestinian Authority is set to propose to Egypt that it open the Rafah border crossing under the supervision of PA security forces...”
That is not inside Gaza. It is the border of Gaza with Egypt, and the P.A. wants to administer the crossing.