All of these make sense. Pro Display - yes it should be updated, but you don't want people to think their $6000 display will be outdated in 6 months, or they won't buy another $6000 display from you. Same with AirPods Max but at a lower price point. Even normal Airpods/AirPods Pro are on 18 month cycles.
The one on this list that is surprising is the iMac. The M1 iMac was awesome, and I don't see any reason they didn't just spec bump it with M2, other than maybe they are using the iMac to clear out old M1 fab inventory and will update it with an M3.