You could say that about any diet. To vastly simplify Paleo, it's like chicken instead of sugary fruit loops. In other words, it goes counter to what may be convenient to eat, colorful, or marketed and branded really well to consumers. That in itself doesn't make it scientific but it starts with an assumption that the easiest and most popular/likable foods are not necessarily the only foods we should eat for long-term health.
That's fine, keep down-voting. Just as I predicted. Note that in my comment I am not asserting that Paleo is scientific but that it isn't really less scientific than most other diets either. The whole point was that there are many different interpretations of what exactly Paleo even is within the group and some of them are more advanced than just speculating which foods the 'caveman' might have eaten. I agree that if that's all you're basing your diet plan on then you're rather unscientific. FWIW, many primitive people who move to the US and begin changing their diets to more convenient (perhaps cheaper, more available) foods begin experiencing health issues.