Yes, TetherX is NDAA compliant. TetherX do not use any components from non-NDAA compliant companies.
Note: Please ensure you are not introducing any hardware components (e.g. cameras) that are non NDAA compliant.
NDAA is about showing that no components from the non-NDAA compliant companies are used, i.e. In order for video surveillance equipment to be installed on U.S. government properties, it must comply with section 889 of the 2019 NDAA. In short, none of its components can be constructed by any of these companies:
Huawei Technologies Company
Hytera Communications Corporation
Hangzhou Hikvision Digital Technology Company
Dahua Technology Company