Two WAN links for $125 ???
I'm quite surprised that the author can get both T-Mobile and Starlink for $125 / month. Twice that much I could believe....
5G service is not widely available in rural northeastern Pennsylvania (1700 miles from Denver, slightly less than London-to-Istanbul), and our DSL never ever reached 1Mbps, so we jumped on Starlink while it was still in beta. That service "grandfathered" into their current "Residential Max" plan (up to 400Mbps) at $130/month. They offer lower-bandwidth services for $55 or $85 monthly, but they would be marginal for a household with two working professionals.
T-Mobile does offer a "Home Internet Backup" plan for $30 (or maybe $20) per month, but around here it would be 4G at best, with bandwidth in the low 10's of Mbps.