Don't believe everything you read or hear on the Internet.
Yea, I know. Your mom probably warned you about that, but I'm just going to reiterate.
It's a fact.
Sometimes well-meaning folks put themselves out there as experts in a field and then think they can provide expertise about an unrelated (or perhaps, ancillary) field, knowing/assuming their followers will buy into what they are saying. With that authority or expertise comes a lot of responsibility - a responsibility to not mislead your audience!
Case in point.