No, it's proof(*) because that's how evidence works. You test your theory -- "prove" means "test" -- with data. If common descent is true, we should see certain things in genetic data. We see those things. If creationism is true, we should see other things. We don't see those things. This means that evolution is very probably true and that creationism is very probably false.
This situation is repeated over and over and over again with different kinds of data. Common descent keeps working, and creationism fails. Creationism fails every single time.
You have no response to that failure, no explanation for it and no way to deal with it. So you demand "proof" and when you are given exactly what you asked for, your only response is, "It's not proof just because you say it is."
(*) More accurately, it's strong evidence supporting common descent. But that's what most people actually mean by "proof" usually, so I'm okay with the word.