The title sounds intentionally provocative -- "face scanned" appears to be just "have their photo taken". I can't find a single source that suggests anything more than that. Which isn't much different from having your photo taken for your driver's license, passport, or at the border, all of which the US does. Burner phones are mostly associated with criminal activity, so tying phones to identities feels like a legiti…
Privacy includes who you communicate with, when, and how often... not just what you talk about.
This is especially true when there might be an unscrupulous government willing to round up social circles for "re-education."