When searching about this photo I found this from 2 years ago. The photo in question is severely damaged.
Yeah but my question is. Are these authentication trust worthy or could they be faked?
don't know anything from your sport autographs but know enough about steiner to let you know he is legit for 100%.
That appears to be a legitimate Steiner COA from many years ago. I will let other members comment on the autograph.
I have a very old Piazza ball with a Steiner cert that I purchased probably 20 years ago, and it does have the steiner hologram with number, and matching card.