Uhh no it does not apply, this works some of the time with german blue rams, most gold rams don't even have this spot or the horizontal bars. The best way of sexing rams is by looking at the rays in the dorsal fin, as I said above. Spangle location is not a positive method of sexing.
Now I know, when I had my Rams that method always worked for me if it was golds/Bolivian or Germans but thanks for informing me!