For anyone puzzled by the graphic's D50 whitepoint marker being in yellow, offset from the color background's whitepoint (the white intersection of the 3 "arms"

For anyone puzzled by the graphic's D50 whitepoint marker being in yellow, offset from the color background's whitepoint (the white intersection of the 3 "arms"), yeah, that's wrong. There's historically been a lot of broken chromaticity code out there, and associated flawed diagrams.