It seems like, given that this is the only post by the account, they made an unrelated-to-their-public-face account and posted something deeply personal technic

It seems like, given that this is the only post by the account, they made an unrelated-to-their-public-face account and posted something deeply personal technically publicly visible to an account with no attention paid to it, and then somebody came upon it and shared it widely. (It's also possible that medium has a "drafts" feature with unlisted-but-accessible posts that they kept it in and someone somehow found a link to it? I don't know, I don't use medium, just spitballing scenarios that fit.) I don't quite understand the desire of people to post something somewhere public but not at the same time, but I have seen people do it before. (That is, I understand the desire when you are, for example, deliberately attempting to circulate information that would be troublesome if linked to you, but less so when you don't actually want it to propagate?) Thinking more on it, I suppose it might be akin to a long-form version of the catharsis some people found from things like PostSecret, wherein people's short snippet darkest secrets were anonymously shared for other people to consume without being linked to the originating party.