I don't believe it at all. Saying things like "serious bid" but with no "formal paperwork" and "drive room" whatever that means doesn't sound credible. Especially when coming from someone and some company no one's ever heard of. Doesn't sound like this guy even knows how acquisition offers are done.
Oh, and in addition Apple buying Tesla would be completely stupid on its merits, which is enough reason by itself to completely disbelieve this.