If you're referring to the Himba experiment (or one of the news or blog posts tracing back to it), the outcome was far less decisive than you're implying. Language showed an impact on perception time of color differences, not a complete inability to distinguish.

https://languagelog.ldc.upenn.edu/nll/?p=18237 https://www.sciencedirect.com/science/article/abs/pii/S00100...