So that's a wrap on that. This merger was the best thing to ever happen to Sprint to be honest at this point. We're finally getting the network that we deserve.
Flashback (11/30/2016): https://www.fiercewireless.com/wireless/sprint-cfo-robbiati-600-mhz-spectrum-past
I just got that same email for my Magic box that has been on Ethernet backhaul for 9+ months (I checked and the serial number matched that unit). It was still on Ethernet when I got the email, since I speed tested faster than Sprint's nearby macros (they're fairly congested even on B41). So they're just blanket sending it out to everyone, even people who are already off of LTE backhaul.