Maybe it's nonsense, maybe it isn't. But either way, you need to measure the fingers correctly. You can't tell from a photograph, especially on the back side of the hand.
The measurement is made on the palm side of the hand. Measure the fingers from the crease at the base of the finger to the tip. My index finger looks like it is nearly a centimetre longer than my ring finger. But in face, measured correctly, they are exactly the same length. (Which, for reference is just barely within the female range.)