PCCR,
Now I am eeally confused, so I went to check the box my remote came in and only found the manual, same version as the one in this link.
https://www.lionelsupport.com/...CUniversalRemote.pdf
I cannot find anything in it similar to what you are referencing, but on at least 4 occasions make reference to up to 3 devices can be connected to one remote, with the exceptions I mentioned above.
Perhaps @Railsounds can chime in and clear it up.
Gary