I will look at the feed, but unfortunately, I would assume it is valid.
ADSB issues are one of the biggest reasons that ADSB-IN is not moving forward.
In regards to the FMS, those of us who work with the system architecture, understand the potential vulnerabilities. It is somewhat unfortunate that this issue has been brought forward in a hacker format...
Edit: In looking through the presentation, I dont have the verbiage of how or what was explained, but the presentation is very accurate. 