If I insist that a ferrari is designed, and have a theory that it is designed by itself, somehow, and I don't include a designer, strictly - then I must come to a conclusion that is natural - yes.
So you must come to a natural conclusion, about something which might not have been naturally created, LOGICALLY.
You seem not to know what methodological naturalism is.
Obviously, every methodological naturalist would agree that a Ferrari has designers.
On the other hand, a methodological naturalist would be committed to trying to understand how a Ferrari came into being without breaking the laws of nature.
And of course, the methodological naturalist would be
right. No miracles were involved in the production of a Ferrari.