Are external data connections considered "unintentional radiation" by the FCC?
An unintentional radiator (defined in Section 15.3 (z)) is a device that by design uses digital logic, or electrical signals operating at radio frequencies for use within the product, or sends radio frequency signals by conduction to associated equipment via connecting wiring, but is not intended to emit RF energy wirelessly by radiation or induction.


Today the majority of electronic-electrical products use digital logic, operating between 9 kHz to 3000 GHz and are regulated under 47 CFR Part 15 Subpart B.


Examples include: coffee pots, wrist watches, cash registers, personal computers, printers, telephones, garage door receivers, wireless temperature probe receiver, RF universal remote control and thousands of other types of common electronic-electrical equipment that rely on digital technology.  This also includes many traditional products that were once classified as incidental radiators – like motors and basic electrical power tools that now use digital logic.

From https://www.fcc.gov/oet/ea/rfdevice
So all of these fall under sends rf signals via connecting wiring