That's interesting. The Wilson specs don't show their supporting T-Mobile 5G. Maybe their specs are not up to date.
Copied from Wilson's web site ad:
Supported Carriers
The weBoost 470144 Home MultiRoom supports the 2G, 3G, 4G LTE and 5G networks from virtually all carriers in the United States and Canada. For other locations, please consult the frequencies listed below to see if this product will work for you.
Here is a more detailed breakdown of the carriers, networks and frequencies boosted by this kit:
AT&T 2G, 3G, 4G HSPA+, 4G LTE & 5G
Verizon 2G, 3G, 4G LTE & 5G
Sprint 2G, 3G & 4G LTE
T-Mobile 2G, 3G, 4G HSPA+ & 4G LTE
US Cellular 2G, 3G & 4G LTE
All other carriers using 700 MHz, 800 MHz, 1900 MHz, and AWS 1700/2100 MHz frequencies