I've had a brief look at the Owner's Manual and User Guide. The former claims the remote is IR and the latter details how to control connected devices through on-screen controls - i.e. the remote "talks" to the TV and TV then communicates (presumably via the HDMI connection) with the selected connected device.
See the User Guide HOW TO OPERATE TV - Screen Remote Control and Universal Remote Control for further details.
To get Brexit through Teresa May fell on her sword - and missed.