What of the mutations that separate humans and chimps? Are those deleterious mutations that are making humans weaker and less fit?
What does this say about design? It would indicate that there is only one possible genome in the whole universe that is fit, and any changes to that genome will result in a weaker species. This would mean no designer could design more than a single fit genome in one single species. Is this really what you believe?
There are some people who think the Earth is flat. That doesn’t force the Earth to flatten out. We need evidence, not guesses.