I'm no attorney...but as solely a 'secret keeping device'
amongst friends, and that appears to be pretty much what she's got going on, the efficacy of those NDAs is at best dubious,
especially when the subject matter has a cosmically
zero chance of actually materializing. And supposing there is a breach, what exactly would the cause of action be, and as importantly, how much would it be worth? Crossing one's heart and hoping to die is probably just as effective secret keeping promise.
I think my bigger confusion is I'm
still not getting where Ketchum's automated 'fame & fortune' teller machine is located. I mean, being there is no Bigfoot and all. Seems getting all caught up in the
pretend DNA analysis of a pretend creature would ultimately lead to nothing but hard feelings and a big trail of unanswered questions. Hardly profitable I'd say, but then again, this
is Popular Bigfooting.

Ate him, of course. You gotta eat 'em right away or you'll get a bunch of nosy scientists poking around looking for a body. And they ate him cause that's what Fox wanted. Sheesh! Sorry Mr. Science Q. Scientist, there is no body, quit asking!
In all seriousness, it's pathetically funny how
they¹ create all these Bigfoot scenarios in which
they¹ have no real-world way of getting out of -
short of producing an actual body - yet do it so often and regularly that when they're not doing it is when they're actually suspect by fellow BFers. It's completely insane.
¹
A BF proponent/charlatan of any sort who refuses to acknowledge even the most painfully obvious of truths e.g. Ketchum, Meldrum, Moneymaker.