That is definitely SA!

I had a similar screen on my OnePlus 8 after switching to TNX yesterday afternoon. I wasn't sure if it was real or not, so I sent a report to you. It did have other stuff though, so maybe it was real.

I've seen n41 in rural-ish areas already, plus some B41 on sites that were 25/26 only a year ago. They seem to be getting better about not just deploying a single band in places, though from what I've seen the more rural setup appears to be whatever B/n71 they have, plus a 5x5 B2 carrier to use as an NR anchor. Narrower bandwidths go further, hence running 5x5 when they definitely have the spectrum for more.