I would rewrite the "press release" to be:
"oh dear, your 20 year old decoder might not work with your brand new state of the art MFX system from Marklin"
So, by purchasing your $1,000 CS3 plus, your $20 decoder might not work...
Clearly not all new technology can be 100% backwards compatible, but one would surmise that most people buying the state of the art (although I think that DCC + RailComm is better than MFX) would not be concerned with a couple of dollars to upgrade old stuff..
Yes, an incendiary bit of writing to be sure.
Greg