The post announcing discovery of the HF audio was made October 15th, 2013. Remember you're reading a reporter's dumbed-down summary of what someone else has found.
So 14 days and still "pending analysis". I don't know where he lives, but it can't be that difficult to find someone with an oscilloscope and the knowledge of how to use it?
Again, sounds very fishy. I would expect a more methodical approach from a security researcher.
https://plus.google.com/103470457057356043365/posts/3reWRqDM...