You should be charitable to the creators of venn diagrams and the countless and diverse group of people who've found them useful for years. For instance, it obviously stands to reason that these sort of visual cheat-sheets are aimed primarily at novices, not experienced/professional DBAs.
Should we critique "lefty loosey righty tighty" because a professional mechanic knows that's not precisely true and should be able to analyze the context of the screw to determine whether it's left or right handed? Of course not, that mnemonic is for novices, not professional mechanics.
https://en.wikipedia.org/wiki/Principle_of_charity