You didn't link the video so it's tough to judge why it's the only source hinting Polestar would re-engineer the Polestar 2 for RWD.
This questionable source's screen grab from a Volvo website in Belgium is persuasive. I searched for this 2024 Polestar 2 info when you first posted your question and I searched again after seeing the vid you posted. The only info I could find on the 2024 Polestar 2 was on TopSpeed, which said the powertrain would remain the same.
The InsideEvs podcast mentioned that the Volvo EVs are changing their single motor models to RWD, so I definitely think it is going to happen. The weight balance of an EV negates the need for FWD in an EV. It does make some sense for regen but that's about it. RWD makes for a better driving dynamic, in my opinion.