The recent counterclaims in this thread are also just not true. The virus which causes COVID-19 (which is called “SARS-CoV-2,” not “SARS2”) is absolutely spread without direct contact between individuals. We’ve known that since early last year. It’s primarily spread via respiratory droplets in the air. I have to doubt that a competent (and real) virologist is posting that kind of inaccurate information.
Is bioweapon defense mode going to clean the vehicle’s air quickly enough that you’d be safe with an infected person (with this or any similar contagion) in there with you? No, certainly not. Is it likely that an infectious respiratory droplet would make it from the outside world into your car through a normal cabin air filter? Also very unlikely. Does the new filter provide some benefit to people who live in larger cities with lower air quality, wildfire regions, or other similar situations? Yes, it almost certainly does.
Think what you want about Tesla’s “marketing names” for features, but even if a feature fails to live up to what it sounds like it ought to do, that doesn’t make it useless to everyone.