Historically, trans and nonbinary people were almost universally included in lesbian spaces. The largest subculture of lesbians who excluded trans people from being lesbians excluded only AMAB people, and/or anyone who has ever had a penis (intersex folks). So, if you're going to start excluding any trans people from IDing as lesbian for "technical" reasons, it would be trans women. Does that still sound good to you, or are you realizing that maybe it's not your job to police other people?