Since no one has claimed the bounty, I did a little looking into different numbering systems and it looks like they are Kaktovik numerals:
https://en.m.wikipedia.org/wiki/Kaktovik_numerals
You are right. Went back and looked at his other pictures. It's a cool system 😎.
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Yeah it's interesting isn't it, still trying to work out how to use it fluently.
