The ISO difference is likely due to a combination of testing error, testing conditions, and rounding. DxOMark showed slightly different results with lower ISO levels being better, but the difference is not significant.
Keep in mind that noise is not the only factor affected by ISO. Dynamic range, color rendition, and contrast are better at lower ISO levels. While you might be indifferent about noise, other factors point to the importance of using the lowest ISO that produces the image you want.
One small error in the article is about the ability to program a function button to control ISO. That's not necessary. Easy ISO allows you to use the rear command dial to change ISO - virtually the same as using a programmed function button. And the ISO will show in the viewfinder when you make changes.