Sure they are. So long as they get to define equality of opportunity. It's when the equality of outcome comes into play that they start crying unfair advantage!
Equality of outcome is antithetical to equality of opportunity.
How so? No one argues that everyone participating in X should achieve the same outcome. What people do argue is that everyone who wishes to participate in X should get the opportunity to participate in X and their achievements or lack of achievements should be judged fairly.
If they meet the standards to engage in X. Are you going to say I should be allowed to be a fighter pilot? Never mind that I don't meet the uncorrected vision standards for any branch of military aviation, why are you discriminating on me because of my eyes?? You're an eyeist!
You’ve stated that you do not meet the standards to engage in X because of the lack of a physical requirement pertinent to the tasks expected of a fighter pilot. Of course anyone who lacked the pertinent physical requirements should not expect to get the job. For instance, no one in their right mind would suppose I would meet the physical requirements ( or training) to be a ballet dancer or to be an opera singer. It is not discrimination to keep me from dancing or singing in public for pay. Indeed, those who have heard me sing might well conclude that it should be downright illegal for me to sing in public.
But, supposing I was still in my 20’s, being female should not keep me from being a fighter pilot. Nor should the color of my skin or the language my parents speak nor the religion I or any member of my family practices nor where my grandparents were born or if my great greats were enslaved. None of that is pertinent with regards to the qualifications of becoming a fighter pilot. Or doctor or lawyer or marine biologist or teacher or police officer and so on. So long as I am able to meet the physical requirements and to achieve the education and training requisite for the job , I should be able to become a fighter pilot. Nor should any of those conditions prevent me from obtaining the requisite education and training.