Maybe it's not all fine, but I don't see any red flags. The seller has good feedback, they often deal in high value test equipment, and some of that equipment in recent sales are demo units, so having a 'new' unit that they're selling for cheaper seems reasonable enough.
Not listing specs is not helpful, stock photos are basically worthless, but maybe a first place would be to ask for pictures of the actual unit or the actual packaging for it, since it's marked as flat out new.