I’m back again…S-works Carbon XL first real bike?

This one I need some real help on. I’m obviously very green to high end bikes, and when looking online all the S-works stuff I see is stupid expensive ranging from $3k-15k if not more. I stumbled upon this one on OfferUp for $1,300 and after just a few messages he said he would take $1k bottom dollar. All the info I have on it so far is the the title s-works mountain bike carbon XL-can’t find the specific bike online from what I’m seeing but similar ones are in the high 2s to upper 3k range. Is this a steal? I’m quite tempted to go pick it up, it checks off about all the boxes for me and I’m more than happy to get a hard tail for my first real bike. Full suspension would be nice but I don’t need it for what I’d do really. I also found a basically Roscoe 8 for $1k (which I offered $800 to see if they’d meet in the middle at $900) but haven’t heard back yet. My budget is $1k absolute max, but I’d like to stay at around $200 because I’m sure there’s random things I’d need. Thanks so much in advance, this sub has been super helpful and prevented me from making some dumb mistakes!