The Rock is..
41 years old
Has had multiple surgeries
Is a movie star who cannot afford to collect more serious injuries
Genetically superior
Has/is on steroids
Is an advanced lifter
He knows his own body and what's good for him.
Did The Rock squat and DL to build his physique initially?
The number one mistake people do is look at what advanced lifters currently do and use that to base what they should be doing. Ignoring that the advanced lifter's routine has drastically changed through time and their current routine is not what provided the foundation of the physique.
Well said my dude