Obviously false. Look at the worlds greatest cyclists and compare them to even amateur bodybuilders. If cycling hills built mass, bodybuilders would be doing them. They don’t.
Atlas stone lifts (and its variations) can enhance posterior chain power, significantly better than any barbell squats.
Obviously false again. The atlas stone uses more back than a deadlift, and neither build hip and upper thigh mass as well as a squat.
Dorian Yates was a succesfull bodybuilder in the 90’s, and did not use squats (bcause of some hip issue he had) and it did not prevent him from developing one of the best legs of that era.
He used leg press, and would have used squat if he could. He didn’t cycle and didn’t lift atlas stones.
Even smith machine squats can develope the quads as well as a barbell squat.
You have lost your mind.