I’m gonna assume you’re talking about Paul Hibbert’s latest video because I don’t think anyone else has release a video about this, at least not recently. Also, your code matches his video description.
The reason he chose an RF keypad is precisely because of your scenario. (Most) RF works on the 433Mhz frequency, while Bluetooth works on the 2.4Ghz frequency.
Without getting too technical, RF will probably work even if you’re 2 floors away, while bluetooth will probably fail beyond 10m with no walls in between.
Also, from what I can tell, the bluetooth integration in HA requires both the dongle and the device to be supported. You can’t just plug in any device and expect it to work.
Basically, what I’m trying to say is - revisit your hardware choices because you seem to have reached some incorrect conclusions along the way. Buy an RF keyboard or a cheap “airmouse” remote which works on RF and you’ll be good. Hope you’re still in time to return whatever you bought!