We recalled him so he can go and play at higher lvl. Don't know if the Austrian league is better then the Scottish league.
The boy has been scoring, in 14 games(11 as a starter) he has 6 goals and 5 assists. He is injury prone, so I assume the plan is too loan him again, get him scoring and sell in the summer
Marseille thinks of a return of Nuno Tavares - lequipe
https://www.lequipe.fr/Football/Actualites/Transferts-l-om-pense-aussi-a-un-retour-de-nuno-tavares-arsenal/1443170
After the departure of Renan Lodi and the arrival of Ulisses Garcia, the Marseille leaders are looking for a second left-back and are thinking about a return of Nuno Tavares, currently loaned to Nottingham Forest by Arsenal, after spending last season at OM.
He was good on all the Rice news last summer and a bunch of other West Ham related news.
A loan is the only way he will get more then 5 minutes per game. Loan, raise his value and sell in the summer, no point in keeping him, Arteta will never ever play him.