Totally agree, they will pretend to want to reintegrate him, even extend his contract as they have a +1 year option and look to get Juventus, Athletico Madrid and Barcelona in a three way bidding war, it’s clear that Mason’s best route is in Spain or Italy. He’s not getting a boot sponsorship, he’s on 75k per week, Barca or Athletico will possibly offer him a 3/4 year contract on 100-125k per week.
Sir Jim probably already knows he’s not coming back but wants to generate interest in a potential fee. At best he might go on tour only to be sold but I doubt that he will even go on tour with United.