Correct. It's important to remember the existence of a placebo effect isn't correlated with the efficacy of the drug being tested. I suppose that is obvious, but placebo studies tend to have a negative connotation.

Notably, the placebo effect usually only effects suffer reported symptoms as in this case. It’s a folk wisdom that it has physiological effects, which is often not true.

So placebo effects accuracy of self reporting? Making perhaps less or perhaps more accurate than without?

I get this. Especially rating emotions 1 to 10 etc.