i don't think that drawing is correctly dimensioned
the current practice is to measure everything from one reference, usually the lower left
so that tolerances do not build up
the values in the drawing are likely correct, as Molex is reliable, but the drawing does not follow best practices
as for the drawing being a copy, it looks like a small piece of the drawing in the link
there is no reason to believe photocopies and PDFs maintain dimension
if you measure the drawing, start by checking several short dimensions and several long dimension in both directions