The author proposes that the corollary to Goodheart's law is:

"Only measure that which you are comfortable turning into a target."

This is an interesting thought but I disagree and certainly logically wouldn't call it a corollary.

As someone managing a system, one approach is to have a balanced set of measurements and to hold some of them back so they can't be gamed by those being measured. I.e. have more measurememts than targets so you can detect alignment drift.