Well they did just say it was in reply to a dead comment, so I suspect that was one person entertaining the possibility of widespread transmission, and there's already at least one more comment here if not two (depending how you interpret them) entertaining the possibility of mutation that leads to easier transmission.

Maybe the "worth listening to" caveat is intending to dismiss those, but I certainly don't think it's the case that nobody is suggesting it or that it's not worth pushing back against.