The idea of this indicator is simple:

• Instead of using one RSI, the indicator is using 3 instances of RSI.
• Those 3 instances of RSI are then used to calculate the "synthetic" value (that is not an average of the 3 since the calculation differs from an average).

As an addition, the prices are pre-filtered prior to be used in RSI calculation. If you wish to omit that part, simply set all the EMA periods to be less than or equal to 1.