Power Line Adaptors Fail

John Petters G3YPZ has produced a video showing how Power Line Adaptors (PLA) fail in the presence of low power RF signals. In this video John tries low power (10 watts) RF on the 18.MHz Amateur Radio band.

So is this the way to fight back against interference from neighbours with PLA networks? It would be interesting to see how low you would be able to go and still jam the adapter. I suspect a couple of watts or less from a personal APRS beacon on the right (amateur) frequency might render a PLA useless and force the user to return it to where they bought it and either go wireless or hard wired. I don't think anyone would seriously recommend this as a solution, but if I was that desperate I might not be so sure.