Here is a chart showing how T-Mobile US's coverage has changed over the past 3.5 years on each band. Data comes from T-Mobile.
You're on Google Fi, so that's not real. You realize being with an MVNO means you're de-priorotized on the network right?
Afaik Google Fi is actually the only MVNO that isn't deprioritized on T-Mobile's network.
T-Mobile’s Ultra Capacity 5G Now Covers 330 Million People
No, it does not.
According to both T-Mobile and the article you linked T-Mobile's 5G Ultra Capacity covers 300 million people while T-Mobile's overall 5G network (which includes the much slower and longer range 5G Extended Range) covers 330 million people.
Here's T-Mobile's statement yesterday:
300 million Americans now covered by Ultra Capacity 5G, achieving the year-end goal more than two months ahead of schedule, while the total 5G network covers more than 330 million people (98% of Americans)
At no point has T-Mobile included band 41 in this data.
They also exclude band 5 (which is only in Myrtle Beach, SC), band 13 (only in Puerto Rico), bands n258/n260/n261 (5G mmWave), band 46 (uses the same wireless spectrum as Wi-Fi, T-Mobile has only deployed it in a few spots of some cities), and some bands that T-Mobile has so far only deployed for testing purposes (ex. Band 48, n77) with a larger launch coming in the future.
The data I'm pulling from does include some 2G, 3G, and roaming information, but I decided to exclude that data to avoid the graph becoming too busy and hard to read.