This is the informal name they gave him; perhaps we can say that it is the neighborhood name for that algorithm update; It was called that because it severely affected the websites that belonged to the medical and health sector.

Although, to be honest with you, the health sector websites were not the only ones affected. In general, it is said that it mainly affected the “YMYL” (Your Money, Your Life in English) websites that basically can be summed up in all the websites that have a direct and delicate impact on people's health or finances.

The websites that were mainly favored with this update were those that had a certain “authority” within the sector; pages of clinics or portals made by entities that are apparently experts in the sector, are the ones that obtained the greatest visibility after the change in the algorithm.

[https://www.fdrlibrary.org/web/seanmeyer/home/-/blogs/1790923 https://www.fdrlibrary.org/web/seanmeyer/home/-/blogs/1790923]