Here’s my extremely inexperienced in college admissions but very experienced in working in a healthcare field: if your son is passionate about this program and it seems like a solid experience with real interaction with different HC fields then by all means let him do it.
I’ve worked with countless college students who started with one goal but half way through the program realized this is not for them whether it’s premed, nursing, pt, etc. In their work at my rehab facility found which profession does interest them oftentimes it’s a field they’d never heard/thought of. It can cost a lot of money and time to make a switch. If he needs to catch up on some rigorous classes could he take a summer class or two? I see on this forum so many posts with very talented students checking all the right boxes but don’t get a real sense that they took a risk outside of the “I must do this to get in that school” box. Good luck to your son, I’m sure he’ll accomplish many wonderful things!