Tanking should be a front office decision. As far as coaching goes, they can decided to emphasize young player development over winning with veterans - but that gets messy. Coaches should coach to win - players should play to win. Those two elements of a team should never actively try to lose.
If a front office is worried that a guy will help them win too many games instead of allowing the coach to develop young guys, then they should trade him for whatever they can get. You tank by bottoming out your talent level and then work to get the assets to build it back up again.
That’s what I think the Jazz are going to do.