Does Xfinity Mobile support apple watch family setup for older family members?

The notation is a bit confusing: The chart column heading reads "Supported Carriers" and Xfinity is the last entry in the column. This fact would seem to indicate that the Apple Family Setup is available at Xfinity Mobile? In as much as Xfinity uses the Verison network and Verison supports Family Setup, that would also would indicate that perhaps Xfinity supports Apple watch Family Setup as well?

Do you indeed know for a fact that Xfinity does not support Family Setup and has no plans to?