This is a bad example. A good sysadmin should fact-check and do testing themselves instead of relying on what other people say.
The world has been full of snake oil salesmen since the dawn of time, all with a highly persuasive sob-stories.
If you rely on shortcuts, like anecdotes or 'credentialism' for those who profess to be experts, then you will get rolled over regularly. That's the cost of using shortcuts.
That information may be fraudulent and put forward by this season's Dr Andrew Wakefield has to be factored into any plan for using external sources.