Someone else is using the same tactic.
They have a Hornby A3 FS which is quite obviously the old model, but refer to it as R3991, which is the new 2022 version with the metal running plate.
https://www.ebay.co.uk/itm/165445604603?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=qUt5b6dfTDS&sssrc=2349624&ssuid=cpI7ZCISRXe&var=&widget_ver=artemis&media=COPY