Some "fake" bikes out there do not start out as scams. Instead, someone repaints their bike, and mimics a famous brand of their choosing. And why not, its their bike. We see a lot of fake Colnagos here for example. Then the bike changes hands a few times, all of a sudden, something thinks they have the real thing, and sell it as such.
In this case, its pretty obvious when the seller claims it is 753 (Reynolds tubing), when you can clearly see Columbus tubing stickers (they could be or are likely fakes as well). Stickers may be real, but you can buy reproduction/NOS stickers just about anywhere.