I don't know what happened with his antigen tests - but there is scientific backed data on their efficacy - and it is pretty good: https://www.semanticscholar.org/paper/Comparison-of-seven-co...
If you care about contracting coronavirus, if for you infection is a death sentence, then you need something daft like a 99.9999% certainty that people and things you interact with aren't carrying the virus, and that doesn't just include their nasal passages; it means them not having it on their hands, or on their clothes, or whatever else.
In the real world, outside of these hyper corporate events, most people I know who aren't vulnerable just take basic measures because if we get the virus it'll probably be fine.
But that's not good enough if you're selling snake oil.