Seems like cruelty to finally put him in the match squad then not put him on when our youth team would have been comfortable. Not at all content with the way we are treating him.
If the 10 game thing is real, as well as its impact on our 'net positive window' demand from UEFA, then I have no doubt the club will have sat down with him and explained the situation; it's not like he'll be feeling 'snubbed', he'll understand perfectly why he's not playing.
If it's not real, then I strongly suspect there will be negotiations going on to see if we can find a compromise to hand him back in January. It'll cost us, no doubt, but we'll make it work to free up a squad place.
However, we have 8 games left in the calendar year, so if the clause is real, he can still appear in 4 of them without it being triggered. If we've not seen him on the pitch by the Arsenal game (which will be our 4th game in 10 days), then you'd have to think Unai simply doesn't fancy him. In this very crowded run of fixtures, you'd have to think he'll be used, even if it uses up a couple of his remaining 2025 appearances, just to give some of the other players a rest.