Ok tested with T-Mobile sim that uses T-Mobile billing (different from TNX) and had no issues connection to SA n71 on A32 5g factory unlocked.
Also tried Tello on unlocked S21 Ultra with SA 71 and had no n71 at all.
Found CBRS at another location in Manhattan, but haven't been able to test it just yet. Here's the Streetview.
Plus, one more Sprint convert in the Bronx:
Sprint eNB ?? (40.86715407494202,-73.90311136271255) --> T-Mobile eNB 894795