You're right, --- it's weak.
I think it MAY be weaker than the article states.
On the Male Pubic Hair, they say it yielded NO identifiable DNA - I suspect that the classification of White male attached to the Pubic Hair in the article is from looking at the hair under a microscope and saying it has similar characteristics to White Male hair.
This is far less reliable than DNA testing. It is certainly not a Match to a white male, but a consistent with by observing similar characteristics.