Thats weak foundation shit. You made a one legged stool and thought it was stable enough to sit on every day.
To look at a different example:
"Medical transition has made me happier in my body" is a great part of foundation.
But if its your -only- stool leg, you could come to the conclusion "so i have a mental illness / medical condition which needs to be treated but that doesnt mean my gender identity is real".