This Pillow Knot Hobo, also known as the Sofio Fiocco Hobo is authentic, IMO

They had been making this bag since at least 2008 up until Tomas Maier left BV and has been sold exclusively in outlets. I think originally, the style started off being sold in boutiques, but were later sold only in outlets.
I believe the purse in the listing is probably from a BV outlet which is why the zipper is a) unbranded, and b) nylon. The colour looks like Camel - the original Camel from 2007-ish, not one of the more recent Camels, which were darker. When items are made for outlets, they often do not follow the current seasonal colours and will with use leftover leathers from previous seasons and/or make bags in colours that sell well.
*Not all outlet bags had/have plastic, unbranded zippers though. This is another example of not having standard "rules" re: identifying and authenticating Bottega Veneta.