He's talking out his ass. The tones won't trip the pagers because the fiber-optics link is speedy?
Wondered about that myself.... sounds like a simple explanation concocted for the news media.
The only issue I could think of regarding "speedy" fiber (and this is a stretch) is that perhaps the timing is off in Heath's consoles and is causing the first paging tone to get there before the transmitter is keyed up, causing that first tone to be truncated and therefore un-decodable.