The article claims that "He said that his group had been labelled a threat to national security by the US Congress". So, the subject of the article says that someone else says he is a threat to national security. But, the article quotes no source other than a man blowing his own horn.
The X-37 is not unknown by any means. It has been on display a few times.
Visually tracking items in orbit is not horribly difficult (I have done it myself with things like the ISS, using an off the shelf telescope and postioning system), making predictions based on an orbital observation is simple mathimatics assuming you have more than one visual observer at the same time.
While it is very cool that he has done this, I just don't see it as the horribly big deal the article would have you believe.