That is not true. The free AP that is included with new cars now has only autosteer and TACC. EAP has auto lane change, Navigate on Autopilot, and Summon (and Enhanced Summon whenever that comes out, if ever).
Up until recently, you could purchase a car without AP at all. The $35,400 Model 3 SR still available also does not include AP.
While EAP was for sale, that was the bottom level of AP you could buy, but when they changed it around, they made basic AP the bottom level you can buy at $3000 and then FSD was the only level up for $6000 more. Later, they bumped up the prices of the cars by $2000 and made basic AP included and FSD remained at $6000.
There are plenty of cars out there with no AP software enabled at all, including some from when basic AP was available for purchase at $3000. Those cars can't go straight to FSD for $6000. I'm not 100% sure on that, but I think so.