I don’t keep an eye on my chromosomes to be sure I have the right number.
Anyone who has a Y chromosome is a male.
The article does show clearly that secondary characteristics are linked to the chromosomes, and that chromosomes mean something. The Y determines if you are a male. Lack of the Y means you are a female.
The left is threatened by that statement of fact.
There are XX males.
Normally when sperm are created, an XY germ cell divides into two sperm, one with an X and one with a Y.
When somatic chromosomes or XX pairs in the female divide, they swap sections of each chromosome in the pair when they produce two X eggs. In other words, each egg does not contain each the original Xs, but instead new, composite Xs.
When sperm is produced, this swapping of chromosome parts is not supposed to happen. However, by accident, part of a Y chromosome can be swapped into an X chromosome. When an egg is fertilized by this composite X sperm containing Y material, the resulting fertilized egg can develop into the male body type.