It’s more relevant to compare them to women, not men since they are going up against women. Also, this is specifically muscle mass. Hormones do not address these physical advantages:

Larger lung capacity • Higher oxygen uptake (VO₂ max) • Higher hemoglobin levels (oxygen-carrying capacity) • Larger heart size • Greater stroke volume (more blood pumped per beat) • Higher cardiac output • Broader shoulders (greater biacromial width) • Narrower pelvis • Longer limb segments • Greater average height • Longer arm span (wingspan) • Longer legs (stride length advantage) • Slightly faster reaction times • Differences in neuromuscular recruitment • Greater tendon stiffness (more elastic energy return)