I don't think it's dodgy, just an idiot seller!
I've been to see many, many cars in my time that have had the wrong description and most of them were from main dealers! It's usually that they know jack sh1t about the cars in the first place. The guy who owns that golf has probably heard somewhere that his golf should have xenon lights and thought "I must have these".
I went to see an Ibiza Cupra sport many years ago and the dealer swore blind it had air-con (was one of my must-haves) but when I turned up, it didn't. He spent a few mins playing with the controls trying to turn the air-con on before admitting "I don't think it has air-con"