Yeah I dunno about the homesickness bit. I'm very willing to believe he's homesick—who wouldn't be if they moved from San Sebastián to London? I'm very doubtful he'd be pushing to leave—what would have changed about his decision to move for money and glory?
I reckon if he were really available, we would've heard something about it, at least in passing, during the Rodri saga.
Nah … I reckon if there's anything uncertain about Zubimendi's position it would be coming from Arteta, but even then I'm doubtful. Zubimendi had one of the smoothest adaptations from Spain to England we've seen, and if he suffered a downturn in form it was because his adaptation was so smooth.
I reckon more likely Arteta's looked at how wrecked all of Rice, Zubimendi and Ødegaard were just turning out in our system last season, and reasoned he needs them all plus Guimarães (and Eze, and Merino, and Skelly) just to continue with his approach to football.