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Autark comes from ancient greek αυτάρκης (same in modern greek) which is made up from two words αυτός (he) & αρκώ (v) which means suffice, so self-sufficient.

I wasn't aware that this word existed in English but I love coming across words like these that I am not aware of, though immediately understand.

Autark might be a more common word in another language the author speaks.

It's a well defined word. Nothing wrong with using it.

The issue is that most people won't know what it means

Probably a German word that snuck in (the author appears to be from Germany), autark would be one of the intuitive terms in that language.