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That's a crazy chart. I even found one that I have an old administrator's manual for, SUSE. It's like 2 inches thick. Goodwill stores are great for finding old tech manuals for stuff really cheap. I discovered a DOS manual for $5 that I then sold to someone in Maine for $100. ROFL.
Ubuntu is Debian-based, so that's correct. Fedora is nowadays basically the FOSS staging area for RHEL, so that is truly different from Debian/Ubuntu.
This (large!!!) distro fork chart is fun