I'm pretty sure PSA does the quick opinion for auction items like on eBay. It should show the item number as a reference. I don't see anything linking that opinion to anything specific. And yes, that signature is so bad, PSA on their worst day wouldn't even consider that as ok.
I guess the new scam would be to get a quick opinion on a legit piece and then pass the opinion off with a known forgery. Some unassuming fool will fall for it, hopefully not.
Of course this guy replies to me that everything is authentic and he uses a "local guy" to "verify" the authenticity. Just one more crook who thinks he is smarter than us.