I think I listened to the same podcast and got pretty excited. He's obviously a respected and accomplished medical professional, but also a very successful businessman. The latter gives me some reason to be skeptical/cautious. When I went to the NCT website to investigate clinical trials, I found that a large number of those with his name in the text had been terminated or withdrawn: https://clinicaltrials.gov/search?term=Shiong

Companies he appears to have a stake in include (the now merged) ImmunityBio and NANT Bioscience. Searches for these keywords also return a lot of terminated and withdrawn trials.

I can't make a judgment solely on that data, but it also suggests homework is warranted.