They mean that aircraft operating into airports without a discrete common traffic advisory frequency, the radio frequencies on which pilots tell each other of their position and intentions, are now required to broadcast on the frequency en-route air traffic controllers use to talk to airlines flying at high levels.
It would be churlish of me to say: "I told you so", so I won't.
It seems to me to be the least impractical solution (and what I'd thought had been the requirement for many years).