This strategy filters out any entries where < 20. In fact you can set the value for threshold. (Generally value under 20 for is considered as non trend zone)
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.