If I were to guess, Skype is probably the most privacy breaching communication tool there is right now. They are giving the information way too easily to pretty much any type or level of law enforcement right now, from police to national security agencies and anyone in between, and it's not just US either.
It's a well-informed classificaton, and he openly called is his "guess". Declaring something "the most privacy breaching software" is inherently subjective and arbitrary, so I don't think anyone here is stupid enough to think that's being passed off as fact. This is obviously just his opinion and you're entitled to disagree, but we've all seen Skype in similar headlines before - do you have a more interesting counterargument?