There really is no magic to this. This indicator basically just evaluates the timeframe and derives a multiplier that is applied to the PSAR Max attribute.
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.