This is another intriguing example from a similar type of product (this is from Razor, a predecessor to the current iteration of Leaf).
This is clearly NOT Hunter's autograph, but appears to be cut from some sort of internal memo. In any case, BGS slabbed what they were paid to; they didn't authenticate or probably even look at the card itself.
Leaf does this intentionally. BGS is stabbing a card made by a company, but many consumers (incorrectly) think that a slab means authentication. In reality, it does not.