There is no way to know for sure if someone is bragging/faking/misselling etc. Different people have different motivations, some of which they themselves may not understand. Some may be real too and are only trying to help.
Its a waste of time to delve too much on other people. Best to focus on your own trading, read up some good books and try to apply. Perhaps try to backtest systematically too based on ideas you get from market.
Another great quote from seykota - “Win or lose, everybody gets what they want out of the market. Some people seem to like to lose, so they win by losing money.”
This seems like an oversmart statement but more time you live through trading and other people trading, more it seems to be true.
No strategy will work without market knowledge. Why do you analyse markets? You must predict market movements and customise strategies. No trading strategy works in all situations.
Charlie Munger was once asked why more people haven’t copied Berkshire Hathaway’s strategy. “More investors don’t copy our model because our model is too simple,” he said. “Most people believe you can’t be an expert if it’s too simple.”