It's always interesting to see the only people who ever talk about JavaFX are either Oracle employees or people who have a financial interest in JavaFX, such as the author of this piece whose business is based on JavaFX.
Oracle effectively killed Java with the Android lawsuit. Java's original selling point was to not be tied to a single vendor's platform. Now Oracle wants to be the single vendor. So long and thanks for all the fish.
I'm not sure what this comment is trying to insinuate? I mean sure they might have a financial interest, but they're also writing about stuff they know well since they use it.
Basically that talk about and use JavaFX are those with a vested interest in JavaFX as a platform in and of itself. Rather than hearing from people who are more interested in the programs that you'd make with JavaFX.
The connotation is that there isn't much adoption of JavaFX outside of a small (Sun/Oracle-centric) group, which has largely always been the case with JavaFX.