Yes, but implementation errors-- not fundamental flaws in the theory or underlying mathematics.

It's not a statement about such things being impossible, just unlikely to come from a single individual working in complete isolation up until the bitcion whitepaper release.

Additionally this alone would be merely peculiar on it's own, coupled with the lack of retrospective investigations uncovering -anything at all- significant about the person moves it to suspicious. Adding in the subject matter of cryptography + pseudo anonymous money and it strains credulity not to consider