I bought 3 barba shirts from this seller. They are on their way. If I see a hint of fake, they are going back. As for L. Attolini .. well, they are not Sartoria Attolini or Cesear Attolini and the label clearly says that it's L. Attolini. No harm done IMO.
'Sator' on AAAC took the plunge and from his review sounds like it's no Casare, but it's still an outstanding Neapolitan-cut suit with a fair amount of handwork. It's not like he's selling them for C. Attolini prices, so I think he's legit.
I sent him an inquiry; he said he's a licensed dealer for L. Attolini and asked what I was looking for. No response to my request though, so who knows.