In popular music I don't believe it's true. You hardly see women singing above F5 or G5, while tenors, like Bruno Mars for example, easily reach A4 or C5. At the same time, you can find women (not only contraltos) singing around F3 and G3, but I can't think of any popular song these days where a male singer reaches one octave lower than this.
This answer does say so, right. There are a plenty of pop songs where a male singer sings A4-C5 and also where a female singer sings F3-G3.
I did see some examples where a female singer sings above F5-G5, but I, too, have never gone through pop songs where a male singer sings F2-G2.