Yes, don't believe everything you read.
Most writers, write not trade. Usually vague and incomplete with a minimal understanding, or worse yet they just regurgitate what they heard or read elsewhere. A very "telling" pattern. "Maybe if you had a grasp on pattern recognition, you would understand".
Gaps are TA tools like anything else, on their own they have minimal value. As RN pointed out upon statistical analysis profitable trading methods exist, fade or continuation. When they coincide with other "TA" events, they are much more powerful. Without the research they are as useful as a coin toss.