Neither the lights nor their method of operation is subject to regulation under the ANO in those circumstances.
Perhaps not, but the use of radio stations is, and the conditions of the radio station licence still apply.
That is not to say that I am particularly agin the idea of PCL, or that I blindly follow the rules without thinking about them. But to argue that PCL is used in another, different environment and so it should be allowed in the UK (or wherever else it is not permitted) is no better than the supposed stonewalling that the CAA has been accused of.
And some GA pilots wonder why the CAA doesn't seem to listen to them......