Let's ignore the headline itself for a moment and try to take the rest of the article at face value.

The idea that is being plainly communicated here is that there's a single system of symbols that is so well-understood that it gets passed along to human populations in Siberia that then cross the Bering strait as well as the isthmus of Panama, and these populations over this period maintain this system with such fidelity that they're recognizable as descending from the SAME system of symbols that entirely separate populations in Europe and Southern Africa are also using.

I don't think an alternative intepretation is reasonable to take away from the "Consistent doodles" infographic or the phrasing like "early humans as far back as 40,000 years ago also developed a system of signs that is remarkably consistent across and between continents".

This is either earth-shaking news that demands an entirely new understanding of human heritage, or it's very obvious pseudo-science.