Hello- Thank you for asking the question here at JustAnswer. I have read what you have written and am happy to respond.
This is a very common question and people are baffled with how creative and annoying the NPD can be. You are correct, they formulate whatever "facts" are necessary to achieve their gains
They are experts at acting and can convince and Eskimo to buy snow.
They leave a toxic cloud in their wake and all around are effected and the person with NPD will lack any awareness or sensitivity.
I think the follow information addressed the best way to deal with the NPD and maintain your sanity.
It , along with several others on the site will help you.
I wish you the best,