As Spanners has pointed out, this is nothing new, the requirement has been there for years.
Note the wording, "A two way communication shall be established and shall remain available..." This has been interpreted as meaning that you establish communications, then leave the headset available for the "responsible person" (in our case so called) to use if necessary.
I suggest that someone in management is trying to wind up the pilots by insisting that they stand there wearing the headset - there is no legal requirement. If management say there is, get a legal opinion organised by your union. (Oh, no union?)