No, that is not the only explanation.
"Thus, shared endogenous retroviruses between, say, ape and man is almost irrefutable evidence that they descended from a common ancestor. *Unless* you want to suggest that they were created separately, and then a virus they were both susceptible to infected both a man and an ape in EXACTLY the same location in their DNAs"
Close, but what the author narrowly missed is the fact that the creatures were created with that make-up in the cells (no need to contract a virus 'fossil' when one is placed there from the start).
Evolution theory can be quite attractive when presented by those who have sceince as their faith. But why not -- many of them are very intelligent and are committed believers in science as their faith.
And Mark Fuhrman planted the bloody glove. The question in both cases is "why?"
Why do all such (and there are many) viral traces lead to tree diagrams that agree with active genes and with phenotypical correspondences?
God did that. And yet Satan gets branded with the tag of "The Deceiver". Go figure.