"All the matters is: can you impose a long term deficit? Whether by paleo, keto or any other dietary method, the sole long term determinant of average body mass

"All the matters is: can you impose a long term deficit? Whether by paleo, keto or any other dietary method, the sole long term determinant of average body mass is net caloric balance." Average body mass (!), not body composition etc. You need to actually read his assertion. He is completely right.