Um actually
It is called pseudo 6 simul because you do one simul move to get a 5 simul afterwards, when we add the first simul move to the rest of the solution (which would be 5 simul) it gives us a total of 6 simul, hence the name, pseudo 6 simul
here is an explanation by the devoloper
And in my opinion, this method has still far way to go, experimenting with different pin sets, maybe even pseudo 6 simul flip and more