Since the article doesn't bother to explain the regression method or its implementation, I'll assume this is ordinary least squares regression, a method invente

Since the article doesn't bother to explain the regression method or its implementation, I'll assume this is ordinary least squares regression, a method invented over 200 years ago. It's only shown to work with two variables, so perhaps it is just determining the equation for a line through two points. Either way, this is something that has been trivial to do using your own brain before even the C64 existed. Of course this is a neat exercise to do on a C64, but in no way does this give any reason to think we're doing something wrong by using more powerful computers to study vastly more data (using more complex algorithms - we are not just doing "the same thing" as in this demo). The gap between showing that you can fit a line to two points on old hardware and concluding that modern data science is one big heap of inefficiency is just too large.