So in some sense I think asking what Adam Neumann and Elizabeth Holmes really believe is a category error. Knowing the truth makes lying really hard. If you spend a lot of time figuring out what's true, that builds mental habits that make lying feel bad. But if mostly ignore "true", then it's much easier to focus only on what Nixon's press secretary called the "operative statement" [1]. For narcissist CEOs, I think they treat the objective truth like a child sometimes treats a scary closet: if they never look at it or think about it, it's not a problem.
[1] https://www.nytimes.com/2003/02/16/weekinreview/the-nation-t...