Sadly it appears that he has no expertise in Virology. He gets the medical facts wrong. Perhaps he should spend time listening to TWIV (This Week in Virology). Or perhaps he could listen to Virologists in THEIR area of expertise. I fear the Supreme Court suffers from the same defect.
People seem to be confused about the vaccine. It works like a smoke alarm. It helps your body DETECT and RESPOND to the virus. It does NOT PREVENT a virus attack, just like a smoke alarm does NOT prevent fires. The result of early detection is that your body can reduce the damage caused by the virus.
This is a scientific question. Visit TWIV (https://www.microbe.tv/twiv/). Today (Jan 8, 2022) there is a blog post by Dr. Daniel Griffin (TWiV 850: COVID-19 clinical update #96 with Dr. Daniel Griffin). He comes on once a week and gives details of the science and updates for clinical treatment. This is his 96th weekly update.
Vincent Racaniello (https://www.youtube.com/channel/UCyFgCoP4ovsHbt92vM4zN2A) has a free online course on Virology, which I can highly recommend. His 2 volume textbook is also available.
If nothing else, a proper education will enable you to recognize when lawyers are confused about the medical facts.
Whether a mandate is legal is a political question. I have no opinion on that.
Whether a mandate is good virology is a scientific question. From what I've learned over the last few years, I believe it is. Don't take my word for it. Get educated.