It is not his real name. Once he upended his life, he revealed his real name here[1]. It is not Scott Alexander.
[1]: https://www.astralcodexten.com/p/still-alive
Scott Alexander are his first and middle names, and Siskind his last name, or that's what I've understood.
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Scott Alexander are his first and middle names, and Siskind his last name, or that's what I've understood.