Gundry is a huge quack. Listen to him on Dr Mike's podcast: https://www.youtube.com/shorts/LulcIT9XRFI -- Among many wtf claims, he claims that smoking is good for you because nicotine has antioxidants.
I think that’s a disservice to quacks - most of them are far better at dressing up their claims in something believable sounding. Gundry is just stark raving mad, it blows my mind that anyone gives him the time of day.