I saw those as well, and though he's right, that bent arms and a stronger core help immensely, I couldn't help but think two things,
1) he's an engineer and the concept of fixed angles that your body is optomised to perform at is appealing to an engineer, for some reason I can't get right behind it from a biological point of view. Things change over time, and even though he's going to have a ton of data from his team's powertaps, and has way more experience and evidence than I do, bike fit needs to change for the majority of people as their situation changes.
2) He is talking about pro riders who have spent years optimising their position. Punters like you and me are working on improving their position, and if there are fixed optimal angles then we may as well all just stop trying to improve and buy an S5. The timing of these posts is curious, in relation to the bike his company has just released.