They may get it cheap, but I'd doubt that means they would deploy a lot of it. Maybe more a protection thing so they don't have huge headaches with possible interference.
In rural and smaller towns I go to, TMobile now is far from deploying their entire pre-Sprint spectrum portfolio. I go to places and all they do is deploy just a single band. If they go back with 5G they just add one more band (600). Or they have all but one band deployed.
Unless they are going to do B41/n41 on every tower like Sprint was wanting to do, I wouldn't keep my hopes up for a ton of rural 2.5. You'd think though with fixed wireless services that doing full builds would make sense.
It depends what plan add ins they had for their Verizon line they tested with. You can pay extra for full hd and get up to 40 mbps for video on Verizon. AT&T doesn’t throttle video much at all on the elite plan.