Hilariously, David is unknowingly supporting @AnnMarieNavar's comparison. Antivaxers frequently go straight for the pharma shill gambit, and his first go-to move is to invoke the pharma shill gambit rather than addressing substance—very much like an antivaxer.
https://twitter.com/LDLSkeptic/status/1144280418277044227 …
In this case, it's not false equivalence. David's first move was right out of the antivax playbook. It's not a good way to start if he wants to show @AnnMarieNavar wrong. It's exactly the opposite of a good way to start.