Leaking medical jargon and mixing it with regular usage: "serious" means needing medical attention, "severe" means hospitalization/long-term disability or worse

Leaking medical jargon and mixing it with regular usage: "serious" means needing medical attention, "severe" means hospitalization/long-term disability or worse. They seem to be using medical "serious" and colloquial "severe", which gives the the appearance of reversing their meanings.