You're incorrect. If you zoom in on the maps on T-Mobile's site, you'll quickly see that most of the coverage you're touting as LTE quickly changes shades to match the color for "2G" in the legend. You have to zoom in to see the color change to indicate the 2G coverage. I just did it myself on T-Mobile's site. The majority of the areas of the maps that you're showing are, in fact, only covered with 2G service by T-Mobile.
Actually, I just realized that the map you took screenshots of only denotes where T-Mobile has coverage. The different shades of pink denote Excellent, Good, Satisfactory, or partner coverage. The pink colors don't denote what type of data coverage it is. You need to look at the maps that denote what type of data coverage (LTE/3G/2G) is provided. You will find those maps on T-Mo's website, as well.