I'm sorry to react this way to a shitpost, but there's a lot to unpack here and somebody needs to do it, so:
Actually that entire meme format is kinda harmful and feeds into transmed stereotypes about nonbinary identities as an inherently invalid intermediate coping step people go through and discard on their way to becoming "real" trans women. This shit also isn't supported by evidence at all. I've recently looked at name change data from my country and by far the most common reason to change gender markers a second time is going from a binary M or F one to either "other" or "none". Almost all the cases where people change their mind about this kind of stuff fall into that category. That mirrors my own transition as well: Originally i needed to process my gender as binary womanhood and needed to socially and physically transition to a point where i felt halfway comfortable in my own skin before i had the security to openly engage with more radical ideas about gender and define for myself what womanhood and femininity mean to me, and that the way i understand it, the way i can live it authentically, lies outside of restrictive binary boxes. But in a society as cissexist, transphobic and stuck in binary oversimplifications as ours, that was just too much to process for freshly cracked me. I just didn't have the experience with living outside of gender norms and with how other people do gender to fully understand what i wanted for me. I needed to see all of that with my own eyes, settle in, and then move beyond the socially more accepted option of binary trans womanhood. I find that this holds true for a lot of other nonbinary trans people as well, but i know very few cases where the opposite holds true and people go from describing themselves as non binary to describing themselves as binary. It happens, sure, but it's much rarer than the opposite development, and in our social climate, that shouldn't surprise anybody.
So these memes completely reverse how such questioning processes typically play out. They make up a lie that nonbinary identities are easier to accept, a lie that hinges on another transmed concept: That validity is tied to passing, that trans people should strive for looks that allow others to correctly guess their pronouns and that therefore an androgynous early-transition stage is better described with they / them or they / she pronouns, when i reality pronoun choices need to be viewed completely seperate from how people present physically and pronouns shouldn't be assumed based on looks.
So am i saying this is truscum shit? Weeeeeeeeeeeeeeeeeeeell ... yes, yes i am saying that. Sorry, no offense, but i have no other way to put it. These kinds of memes are really shit to nonbinary transfems, even those of us that use she / her pronouns like me, they feed into the insecurities of people that do not clearly pass as one binary gender, they are just all around harmful and prescriptive. I get that people are only joking, i do not think most posters who share these kinds of memes are truscums themselves, but the format relies on not questioning, but replicating transmedicalist and binary-reinforcing notions of gender, and i'm gonna call that out in all trans spaces i'm in.