No, there is no support for real Amiga keyboards in current firmware. The person on the forum have been apparently joking. Amiga and PS/2 keyboards have different protocols. But it should be relatively easy to add support for real Amiga keyboards (the ones dedicated to A4000 and CDTV can be connected directly).
I would love a CDTV KB for my 1.1 minimig
and the new Minimig...