Using a machine learning approach to crunch through the data, the researchers grouped patients based on their condition and the amount of time they spent in intensive care.

Into the trash it goes.

Short reminder that doctors used ML to detect the severity of COVID cases from x-ray images. All the algo learned was people standing/lying - cause the severe cases in the training set were on a bed, while the healthier ones were capable of standing.
There are many more stories about docs fucking up ML stuff.