he has a great point actually,
when i was 23 i hit my leanest by eliminating all cardio and just focusing on weights and diet. i would eat only fat and protein and cut my carbs to under 20grams a day.
the lack of cardio probably helped support my hormone levels and allowed me to lift and recover better. the additional muscle gains helped increase my resting metabolism.
i never was so lean in my life, and i did ZERO cardio but i lifted like a madman (but only about 5-6 hours a week total) and did not eat like a normal human.