There's an entire cottage industry built around the concept that you can successfully trade the market if you follow pattern recognition (flags, pennants, head and shoulders, engulfing reversals, gaps, double and triple bottoms, cup and handle, ad nauseum... and even this 3 bar play). Software, newsletter subscriptions, managed money, etc.
Given the number of stocks available for trading and the number of 3 and 4 minute periods that occur in each one during the course of a trading day, the set up pattern could possibly occur 1000's of times a day. The question is, should you decide to accept this mission, is how many of those hypothetical 1000's of occurrences actually succeed rather than result in a losing whipsaw? My guess is that like most purveyors, the video's author cherry picked some fantabulous results to demonstrate the ease of doing this.
Your video was TLDNR and I don't know squat about the author. But I'd ask you this: If this pattern is the road to riches, why his he hyping it in a YouTube video rather than trading the sh*t out of it and laughing all the way to the bank? Jesse Livermore, Richard Dennis, Paul Tudor Jones and what's his name in the video ??? Uh-huh.