He didn't flub, though. It was intentional. Too bad it's way too high brow to be noticed.
Disinfectants in vaccines:
https://twitter.com/Vanessa_Dag_/status/1253807331143548928
Light at the end of the tunnel:
https://www.science.gov/topicpages/u/ultraviolet+b-irradiated+premalignant
I mean, sure he could just come out and explain this shit to everyone, and lock up all the perps, but where's the "fun" in that? Something about the journey, right?