Of course he is immune he got two massive doses of synthetic killer antibodies. This is also why he tests positive for those less than a week later which is too soon for natural immunity. He got Regeneron it’s effectively the antibody cure. The FDA has been dragging it’s feet for political reason granting the EUA that potus ordered so the rest of the country could have access to it. You can bank on Christie also getting the treatment while he was in ICU
You can bank on not getting the same treatment for you or your loved ones.