Knowing Jesus injury record and the fact that Nketiah ain’t good enough, Arteta should have prioritised the striker situation ahead of getting a new goalie and spending what should have been "new striker funds" on an actual goal machine, instead of Kai Havertz.
So he's probably right, it isn't realistic to get a striker of calibre in Jan. There simply won't be funds without selling.
On a separate note, Martial will be free in the Summer, I could see him fitting with the way Arteta's Arsenal play.