Well, yes If you use this tool properly with accurate data in identifying the past movements. However, not everyone is following one TA, and that's one of the many reasons why It became less effective. So, that's where the fundamental news came in, to help you further to get closer on the next possible Btc movement.
Not as simple as you think. Understanding the market and tricks won't make things easy in trading.
A lot of things to consider in trading such as TA (the link you provided), Fundamental news, market trend and sentiments, etc. But, the most important thing to acquire in trading is experience. All of the tutorials, tips, TA's, and other tools means nothing If you don't have enough experience in trading.