If you read down in the comment thread on the Hackaday article, they make it clear that Fords after about 2002~2003 have an attempt limit. I happen to know that

If you read down in the comment thread on the Hackaday article, they make it clear that Fords after about 2002~2003 have an attempt limit. I happen to know that my '05 did, at a bare minimum. It's still deeply not secure, but nothing about a car really is... It's intended to make my life convenient and keep the honest people honest.