The Acclaim was only ever a Executive with a safety pack added and was by far cheaper than an optioned up Exec, thus why they sold so many.
Must admit I didn't notice the NO A/C in that case he's absolutely dreaming at that ridiculous figure and also as suggested 179,000k's isn't super low, yes it is low for a 1997 built car, but it's not super low like 79,000k's would be seen as. I'm sure it will be discounted down to the mid 3's at some later stage.
Update !
It does have A/C (check the A?C button in the fascia panel next to the Rear Window Demist and Hazzard Flasher) but the idiot just hasn't corrected the generic tick and flick list in the gumtree listing process.