I don't believe this news at all, I think it is a kind of false information that people spread through social media. Why would Barcelona consider sending him back to Manchester United after only three games this season? The player may not meet the team's expectations after the three games, but it does not mean he should be sent back. Perhaps the player will find his best form again at Barcelona because Hansi Flick is a great manager.
There's no truth in the news. I'm sure it was posted by a social media influencer trying to farm engagement. Fabrizio also reported on the
rumorrumour, and he branded it false. Like you correctly pointed out, it's just three games, and he's adapting to the league and his new club. The manager appreciates his contribution to the team, and there's no intention to opt out of the deal they had with Manchester United.