Based on what? ACC/LKAS has been a feature since before Tesla even existed as a corporation. You might be confusing their claims about FSD with AP (which they very much would like you to)

Similarly, they love for people to compare AP to all driver crashes and fatalities when AP only works in the situations that are otherwise least dangerous to drivers, in cars that are newer than the average car, driven by a demographic with higher than average safety records, etc... which means AP would need to kill a lot of people to not have better numbers than average