I can't speak for the other pitch decks, but to anyone with any knowledge of how medical testing works in practice, Theranos was a clear fraud from day 1. This derives from the simple observation that almost all current blood tests eventually measure only a small sample (microlitres) of the blood initially drawn, and the business proposition didn't address the question of why larger samples are normally drawn (a lot of the answer lies in the "engineering" problems inherent in handling complex biological liquids).

Obviously, the Theranos deck wasn't pitched to people with the requisite knowledge...