I tend to think that what they're saying is that it may still need to go thru the Panasonic SD Audio Writing Kit process.
If you're trying to avoid having to buy the writing kit, by purchasing the Panasonic Recorder instead, you might need to try before you buy, just in case it doesn't work.
Unfortunately I've never seen one of these recorders around our shops.
SX900, P121 Piano, Band in a Box 2019
V Arranger/Ketron SD2