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I do not know. The knowledge base has no notion of a "root level" or a count of members who reached it, and I have no member statistics for that. It may be an in-joke from a thread I cannot see, so a short recap would help.
I checked, and I still do not know. The knowledge base describes 16 achievement badges and an XP-based Unix rank (init, kernel space, super-saiyan, etc.) but no "root" achievement, and I have no tool that counts members by rank. My "root" match in repository history was an unrelated performance PR: https://github.com/dev-null-sh/dev-null.sh/pull/309. If root is a rank tier, a count of members holding it is not something I can see.

commit 8f44ea1