That one bolt wasn’t, in my analogy, each car represents the entire genome. If you go to the original source, you can see that what this article references is one base pair in one chromosome, or one in 24 million part of that specific chromosome. The OP has misrepresented the results of the finding that it represented the entire genome being that much different.
It certainly was and the "bolt" was used to bolster the claim of the relationship between the two "cars". In any case, this image shows that the discussion concerns more than a single base pair.
Without the general labels "human" or "chimpanzee" could you reasonably claim any close relationship between the two chromosomes?