I can use that same logic to say that sugar and carbohydrate consumption has gone down while obesity has continued rising:
http://2.bp.blogspot.com/-0OuoFyJtZuI/VkofY-qgeOI/AAAAAAAAbb...
http://3.bp.blogspot.com/-fUv755XU-3g/Vkof8Eln2WI/AAAAAAAAbb...
The main problem is still OVERCONSUMPTION of highly processed and hormone filled foods
As for growing obesity, there is a lot of evidence that points to toxins in our food as an important factor:
https://www.youtube.com/watch?v=ieQBdS9cN0I
Most of these toxins are concentrated in animal products.
People are also eating a lot more cheese which contributes to obesity:
https://www.theatlantic.com/health/archive/2013/09/now-is-th...
Of course refined carbohydrates and sugars are also a big problem and they should be scrupulously avoided.
I don't think that makes him a bad person or the website valueless but it is hard to argue it does not have a strong ethical vegan bias.
At the moment I would claim that overconsumption of highly processed, mostly plant based foods is the real nutritional disaster. Meat consumption is falling in many places but obesity and related diseases are still getting worse.
If you don't have ethical concerns I think low to moderate consumption of animal protein as part of a balance diet is still probably sensible. You probably want to avoid processed meats and charring. But we are all going to die from something and statistically it probably isn't going to be from eating an occasional steak.