To be honest it's difficult to make a judgement call about the bike without appearing rude. It's a supermarket/sports store generic MTB lookalike. It will be very heavy. Having tried to make a few of that sort of bike ridable for various of my lad's friends I can say that it will happily go along the flat when pedalled. It will stop if you pull hard enough on the brakes. The kit it has on it is Shimano. Very basic Shimano, but it's better than Chinese copies. The Revoshift will work for some if not all the gear changes you would like to make, at some point, and eventually. That fork is , I'm afraid, an unnecessary encumbrance. Triple plant forks on proper downhill bikes have a purpose, but that fork is designed to look like a DH fork. It will add a hell of a lot of weight to the bike, and may spring in and out, but won't damp and may even pogo/bounce on the wrong sort of terrain.
As for "dual slalom geometry" well, the frame looks like a 4X /DJ hybrid, but I'm not sure it would survive much airtime. To give it its due, it's clean, which may say more about how unpleasant it is to ride it than how well it's been looked after. I suspect it's been gathering dust in a shed rather than being pinned on local highways and byeways.
Buy it if you are determined, but you'll have to be aware of its shortcomings. It'll do towpaths and parks, but I wouldn't ride it off road. It won't do very far for very long either, unless you are wanting to build huge leg muscles.