Poland is, I think, giving a none-too-subtle Finger to a few NATO allies (particularly Germany and France) with this move.
As a practical matter they are - rather than relying on NATO for AEW - establishing an organic AEW capability with the NATO AEW as a back up/supplement (if the various allies can get off their butts and approve a deployment on any given Sunday).
I wonder when these AEW assets will earn IOC, in Poland? Is 2025 to soon?