Find me the NCAA rules for what your saying because that’s not true from what I’ve seen. It’s doesnt say it has to be season ending.....
Literally like the first three links on google...Plus I had to go through this myself when I was a student athlete.
https://www.athleticscholarships.net/2012/07/17/how-get-medical-redshirt.htm
https://www.fromtherumbleseat.com/platform/amp/georgia-tech-football/2015/10/7/9457847/football-the-medical-redshirt-explained
https://informedathlete.com/medical-hardship-waivers/