On the other hand..
even if the information in the slides isn't 100% accurate and is only intended for higher-ups - it still reveals the mindset of the organisation and what is considered acceptable practice.
So even if a slide says 'we managed to obtain meta-data on 95% of all mobile calls in 2013' - it doesn't matter if the number is accurate - the intention is still there and there is almost certainly an effort to obtain 100% of the that meta-data.
Good article though, it raises some good points.