First, I have to say I'm very pleased with the TSA landscape having flown it several times in real life, but the description on the download is incorrect. TSA is west of the published location on the file.
It (TSA) is directly south of the city of Midlothian which is, south of Lake Joe Poole and the borders are pretty much I-35E from Dallas (thru Waxahachie) to Hillsboro and I-35W from Ft Worth (thru Alvarado) to Hillsboro.
The northern boundary seems to be Hwy 287 from Waxahachie to Mansfield.
I'd like to see this changed because the scenery is a fun place to fly, very well executed and I don't want people to miss or not download it because of an accidentally incorrect description of where you're flying.
BTW, on my last trip to Mansfield I stopped by TSA and told them about Condor and the TSA landscape.