The claim was that we should assume Odin's author is experienced because he wrote a successful language. If we've decided it doesn't matter whether it's successful then the claim was entirely circular. Yes, the creator of Odin is indeed its creator. Nobody was disputing that.

Even if he was unsuccesful but tried long enough, that would still make him experienced.

I don't see how a detailed comparing of language successfullness would bring anything valuable to the point being made about the author being experienced. That seemed just a noise.