Tyrrell_McAllister comments on To signal effectively, use a non-human, non-stoppable enforcer

[Tyrrell_McAllister]

I puted no such diagram

I thought you had because you said

If you treat P ⇔ (Q ⇔ P) as an acausal statement, you can show its equivalence to Q, but it is not the same causal network.

I took this to mean that you were treating P ⇔ (Q ⇔ P) and Q as causal networks, but distinct ones.

You also said

I can set P.

I took this to mean that P was an exogenous variable in a causal network.

I apologize for the misinterpretation.