Advice on my Scenario Pt.4

[OrangeK]

It is a technique used in lieu of full NO CONTACT, like NONE.
For use when you need to co-parent or otherwise co-exist with a toxic person who will manipulate, lie and feed off of your attention (positive or negative attention, they desire both)

think of it as Going Dark on steroids.

The point is to be as boring as a grey stone. So they find you dull and uninteresting and will leave you alone as you are not a good source of negative attention, admiration or drama.
Answer all questions in vague, boring ways, do not let them know anything good going on in your life.
give no information to them at all, for any reason, unless you are legally required to do so.