Some people live a fantasy life online. Part of the fun for me, besides sock puppet hunting, is to identify those who are frauds. As you well know, there's a huge difference between making a claim and being able to live up to that claim.
Lots of people can use Google and simply cut'n'paste answers to questions about their alleged profession. Some are too demented to even do that such as your favorite fake teacher. LOL Someone who has actually lived a 20-30 year career will have personal anecdotes and opinions based upon a POV of that career. Over time, inconsistencies will become apparent if the person is a fraud. One being giving notoriously bad medical advice yet claim to be a doctor.