Here's two on youtube, do you think they present valid scientifically based views or should they be rebuked and/or have their licenses revoked? If you disagree

Here's two on youtube, do you think they present valid scientifically based views or should they be rebuked and/or have their licenses revoked? If you disagree with these doctors, why? Dr. Richard Halvorsen (England) https://www.youtube.com/watch?v=zMs1ue8j9CM https://www.youtube.com/watch?v=zMs1ue8j9CM Dr. Suzanne Humphries (USA) https://www.youtube.com/watch?v=SFQQOv-Oi6U https://www.youtube.com/watch?v=SFQQOv-Oi6U