[Physicist]

This article is saying that the gene event occured in hominids about 20-30 million years ago.

The article said hominoids, not hominids. The term "hominoid" comprises the apes as well as the hominids.

[Ichneumon]

The article said hominoids, not hominids. The term "hominoid" comprises the apes as well as the hominids.

Right. Another article on this finding (at BBC News) says that "gorillas, chimps and orangutans" (and other "higher primates") have this gene as well.