This article from December 2022 via Sam Wallace sheds some light on who actually is the United fan from the Qatari royals. And he's saying it's the son of the Emir who is a big United fan and has lived/studied in the UK and is well versed in the history of the club. I would guess it's him who is pushing to buy the club.
Sam Wallace: "The Emir of Qatar, head of its absolute monarchy, Sheikh Tamim bin Hamad Al Thani, fourth son of the Emir, Sheikh Hamad bin Khalifa, who won the Fifa vote to host the World Cup finals, is a Manchester United fan. Not just a casual fan but, to those with knowledge of the situation, a committed United fan well-versed in the club’s history."
"Telegraph Sport can reveal that Sheikh Tamim, who attended Sherbourne and Harrow School, invited his old class-mates from the Royal Military Academy in Sandhurst to Qatar to watch a World Cup game. Videos of the visit for the World Cup even show the Emir delighting at the nostalgic experience of the class being shouted at by their former colour sergeant – for old time’s sake."