I am familiar with the auction house first hand. They are about 3 hours south of me. They used to attend the auction I ran, and the high end auction by the same company, and purchase items to resell in their auctions.
Although I do not feel their ID's are intentionally incorrect, they regularly make fairly simple mistakes in attributing glass. I would assume they likely used the listing on ebay for theses pieces, thus identifying it as Salviati.
Funny thing is, that I believe the second item down, with the Gryphons or Dragons on them are actually most probably Salviati production which can be fairly easily identified, yet those are listed as generic Venetian.
I am also not so sure the Tiffany piece in that same search result is correct, as my experience is that Tiffany regularly signed around the pontil, even if in decor, and signed in a counter clockwise direction and not straight across a polished pontil.
I do have a friend I will ask about that piece and report back, as he is exceptional with American art glass and has a large number of Tiffany pieces.