You probably were misinformed or not informed. I’ve never heard of the ability for Homey Cloud/bridge to learn 433MHz (and IR) signals, neither I can find that info anywhere.
It is just not possible for end users, same thing with the previous and new Pro’s.
I agree the lacking of this ability (for the Pro at least) is a bit silly, while several E15,- devices exist which can learn and send IR and or RF signals.
For IR there’s by default quite a big database of remotes available though.
Well, there was and is a bit of catching up to do to have apps Homey 2023 ready, while apps for it should be upgraded to SDK3
Here’s a pretty actual status topic for that, and there are many updated apps already.
I’ve read someone is picking up the Broadlink app, so hold your horses for a bit 
