The relative luminance will still make the yellow "feel" brighter than the others. In the article, the initial stated goal was to have the colours carry a similar relative level of emphasis.
If you don't want the weird perceptual emphasis inversions of yellow, maybe don't use yellow?
The article points out the commonly held reason to use it is the "traffic color patterns", but it is easy to forget that early traffic lights intentionally put the highest emphasis/most "alert" color in the middle, because that is the shortest and most dangerous phase and needs the most attention. Plus, as other comments keep pointing out even modern traffic lights in most countries today think yellow is too strong an emphasis color and have shifted towards amber/orange.