As far as football memorabilia goes they are 110% they do paid signing sessions with top ex and current players.
I have purchased 8-10 items from them over the years. They also do boxing, rugby and cricket so I am guessing basketball is their latest venture although I've never seen anything basketball related. What I will say is that their postage is horribly expensive but their gear is great.
Dunno if that helps but my experiences with them have been spot on.
Someone is probably trying to use their reputation to pass of some fake stuff mate. They always have one of 2 things.
A) a picture of the depicted athlete in the paid signing session
B) a picture of the actual item
As per either example that I've posted.
I think whatever you are looking at is likely not genuine or from a simarly named company. A1 have a proper website for purchasing as well as their eBay store.