Don't go dragging me into your online arguments.
However, if you read every word, specifically, absentminded, it doesn't sound like the person that wrote this is trans or was taking estrogen with the intent of transitioning; I'm speculating and making inferences. (How the fuck someone absentmindedly takes a drug lends itself to the theory that the original author didn't have a doctor's prescription for it, but again, I am speculating.)
But yeah, there is nothing stopping someone that identifies as male from using estrogen. The author could have been taking something like spironolactone, which is an anti-androgen drug used to treat acne, which has a minor estrogen effect.
You don't have to be female or identify as female to be taking estrogen/estrogen like medications.