Absolutely not! In my opinion, Cargurus is the best website out of all the non-Tesla specific websites, but the best one is from Tesla.com itself
This is simply because Tesla takes into account their own new car pricing changes, early/late production pricing tiers, and know how much Autopilot is and isn't worth. They also know the options on their cars... Most on Cargurus are from dealerships, and they don't even know what kind of Autopilot package their cars have, but charge for it anyway.
On EV CPO you can search for exactly what kind of car you want. Just yesterday I saw a SR+ with a few thousand miles selling for under 35,000
It has sold now, being a great deal!
Wish you the best of luck in finding the right car for you