I grew up in a heavily meat eating family. Common meal schedule would be something like bacon and eggs for breakfast, cold cut sandwich for lunch and beef stew, lamb/pork chops or chicken for dinner. I almost constantly had stomach problems as a kid. Constipation, gas, and very bad stomach aches off and on. In college, I started eating less meat and adopting about a 20/80 meat/veggie diet. It took a few months to adjust, but after that, the stomach problems were gone.
This Baker guy is a quack. All he has discovered is that increasing protein intake is helpful as you age because your ability to metabolize protein declines with age.
Otherwise, this is the same trick as keto, Adkins, etc. It is easier to do a calorie deficit diet with lots of animal protein and fats because you will feel full.
But the science is unanimous on what happens in the long run. Meat eaters are off the charts when it comes to heart disease, cancer and diabetes compared to those with a balanced diet.