No Anticipation Violation, Conditional Parallel Trends, Heterogenous Treatment Effects with Ashenfelter's Dip? Pedro's Checklist, Step 4(h)

One day, when my body is long gone, somewhere there will be a small, tasteful marker to remind everyone that I was alive. And on it, I will have the following inscription.

“Here lies Scott Cunningham. He died writing about Ashenfelter’s Dip while trying to get past step 4 of Pedro’s checklist but never successfully did so.”

I am have completely hit the …