What's the point of casually dismissing this article's premise? Whether the conclusions are fully sound or not isn't the goal of this article, this is journalistic not academic. The goal is to raise awareness of a potential bias, and I think it achieves that (assuming the facts all check out).

For one, according to the article the discrepancy was found to be up to 8 points in some cases, not 3. And it seems reasonable that quick, practical decisions in hospitals are made based on point thresholds, not purely huge point leaps as you suggest.

I haven't dug any further than the article and your comment to verify these facts. But rather than find a way to prove why this doesn't matter, why don't we assume it does? Then the knowledge and awareness might spread a little bit more through us, and if it is an issue, it might be that much more likely to be solved. There's no penalty for being wrong with a weakly held but well-meaning assumption. At the very least, we can be more aware of another possible dimension of bias in technology.