i kind of agree, but i still think we can get some key factors from it by comparing it to the female roe depicted on it, like:
body mass: they seem smaller than female roes - which kind of would make sense since male hroths are smaller than male roes.
body mass distribution: they seem to have more feminine features (well what we would consider as „female beauty standards“) compared to that roe depicted on the murial. wider pelvis or hips or what it is called in english xD, smaller waist, smaller shoulders, maybe a more buffed up female highlander or a smaller „better proportioned“ female roe?
it‘s just my speculation tho. nothing is really set in stone until we see them 3d rendered ingame, i agree with that. but i reckong, if they follow these key factors, the chance of seeing a female hrothgar being just as buff as their male counterpart seems rather slim.