In which case Doug has it right. The reader inferred something from Doug’s post. (I doubt Doug implied he had nothing more to offer than the average hobbyist, so the reader must have inferred that. Or so Doug implies, anyway).
You are implying Doug doesn’t know the difference between infer and imply. Doug can infer from your post that he does, and you don’t.
You are implying Doug doesn’t know the difference between infer and imply. Doug can infer from your post that he does, and you don’t.