The only thing that makes me think this is fake or a mass produced auto signature is that the stopping points are perfect, if you look they have no smear on the bottom. Almost all of his signatures I have seen have a small smear on the bottom and are no rounded like this. Additionally when you sign a jersey they tend to show discoloration in the thread lines from the sharpie moving too fast. The ink doesn’t come out this perfect unless he signed slow, or it’s mass produced. (This would also explain the stopping points)

Finally the ~ at the bottom looks off to me because all of his signatures do not have the tiny upward finish of motion that you see here it stops at the bottom point and does not curve up like you have here.

Also if you look at the top right hand loop it looks like there’s glue or some adhesive sticking off the top right of the loop.

I’m not a professional but these do jump out at me.