Fred was unavailable for the first two pre-season games, that is all. He was used as a sub in the other four pre-season games and then wasn’t selected for the squad at all once the league games started until Pogba was out, where he was put on the bench and Matic started. There was ample opportunity to get him into the side and match fit before he has done - if that had been Solksjaer’s intention, his preference, then it would have happened.
It is abundantly clear that Solskjaer began the season with Pogba and McTominay as his first choice midfield pairing in a 4-2-3-1 - Matic and Fred were both readily available for the opening fixture and throughout the initial run of games. Fred started his first game in the Europa League alongside the other backup/ rotation options.
I’m not sure which facts you find contradictory to this? I’m also not sure in what way we shall ‘see who’s right’ - what happens moving forward doesn’t change how the season started.
The consensus now seems to be that Pogba should/ will play in place of the current starting no.10, with Fred and McTominay maintaining their place in the lineup. I can certainly understand, and wouldn’t disagree with, the ‘should’ at this moment in time. I don’t think it’s a given that that’s how Solskjaer will see it though - it’s all up in the air. He evidently preferred Pogba in the deeper role before the injury trouble but it’s also clear that in his absence Fred has established himself in the team.