Oh my fucking god how is this so hard for you.
GENDER IS A SOCIAL CONSTRUCT.
SEX IS INNATE, BIOLOGICAL REALITY.
TESTOSTERONE IS LINKED TO SEX.
But yes you are right, we need to understand and accept biological differences of sex, the conclusion being that women have their own sports categories and safeguarding from men when in vulnerable situations.
400 years ago men wore wigs and painted their faces. Then only women did. Then in the 80s men did again. This could flick back and forth forever because it is a gender idea, a social norm associated with sex, but not caused by sex.
Testosterone levels are not an associated idea, they are a reality. women are not all of a sudden going to start naturally producing male levels of testosterone, and then swap back some decades later. Because it related to biological sex