Nobody wants him in DM, they want him next to a DM.
He started as a CM though in his and Ajax's best season in 18/19 he played more as AM. When De Jong left, the formation changed in 19/20 and he started playing more in CM again, as box-to-box. He's played quite few games in DM as well, but that was mostly in his younger days.
In any case he's seen mostly as creative CM who can play with a DM and another CM/AM in midfield. Yesterday he could have played instead of Lingard (not that Lingard coming on for 5 minutes mattered but hey) or could have come on for Matic, if Fred switched to play the defensive shield instead.
EDIT: All of that is quite moot though. It's clear he's not trusted in the slightest by Ole. In any capacity.