Why would cargurus.com post an "instant market value" of a vehicle that exceeds the original MSRP of the vehicle?

I'm looking at purchasing a Ford F150 SVT Raptor.  When I looked at new ones, the salesman said I should expect to say "sticker" for the truck (aka MSRP), as these trucks are highly sought after and limited production models.  To try and save a few thousand dollars, I've been searching used ones.  And, because I'm looking for specific options, I've been using a Ford labels website, along with the vehicles VIN, to see the list of options.  On this original window sticker is the MSRP, and some of the dealers with used trucks for sale have values that exceed this new MSRP.  

I'm doing my homework looking for a vehicle.  It's frustrating to see a dealer asking more for a used vehicle with 12k miles than it was brand new.  It might be even more ridiculous for cargurus to call this truck a good value, as it's under their "instant market value".  But what takes the cake is I've seen it on at least two vehicles today, and one says it's a great deal.  

For those out there who want to use the instant market value tool, beware.