Being feminine/masculine are personality traits, not a gender markers.
A cis man can be feminine, he is still no less of a cis man.
A cis woman can be masculine, she’s still a cis woman.
A trans man can be feminine, he’s still a trans man.
A trans woman can be masculine, shockingly, she’s still a trans woman.
An agender person can be feminine, they’re still agender regardless.
Having a masculine or feminine personality doesn’t dictate what gender someone is, or the validity of their gender.