Since no less than 18 LTE bands have been confirmed, this handset should be compatible with all major 4G LTE networks in the US.
http://www.notebookcheck.net/Xiaomi-Mi-5-is-ready-for-the-4G-networks-in-the-US.160526.0.html
This has been disproved a while ago already
If you care to give us a link to prove it, we would be grateful. Otherwise, you are just throwing words around.