This is also great parenting advice. Give your kid the feeling of having chosen to eat their vegetables, and they'll devour an entire plate of them.
Only he decides by choosing between 2-3 options we've selected in advance to match what we want the outcome to be.
Similarly it's always bedtime before his actual intended bedtime so he can negotiate some extra time. It avoids so many conflicts when he smugly believes he has gotten exactly what he wanted out of us.
I think works on pretty much anyone, you can just be more blatant about it with some people than others.