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The build scripts of OpenSSH are irrelevant. The malicious code is embedded on building an rpm or deb for liblzma itself and becomes active when the dynamic library is loaded. There is a recent PR for systemd that instead of linking to the compressors during build dlopen-s them when used (https://github.com/systemd/systemd/pull/31550) which disables this particular path, but any load of a backdoored liblzma makes sshd exploitable. Lennart Poettering stated on a mailong list that e.g. libselinux als lonks liblzma and ends up in a lot of services on SELinux-enabled systems.
Are we ever going to figure out who Satoshi is? Probably not anytime soon but we can look for clues. Jia was obviously interested in OSS security and fuzzing[0] but my wild guess is that s/he is not a state actor. I would rather assume s/he is a hobbyist opportunistic hacker who got trigged by the thought "If I can exploit this, why not?". I assume he intended to build a botnet and do whatever s/he came up with. The initial motivation could've been like I said opportunism and perhaps technical challenge of exploiting the software.
[0] https://github.com/JiaT75/oss-fuzz