Why? Because she's shopping it around, hoping Netflix (or someone) picks it up? I guess she can't just say that, so fans don't start putting pressure on those companies, which would poison the show to them.
She's right about pilots, and that part of the article is worth reading. A lot of pilots do air, and sometimes they're the first episode, and you wonder what was going on... they filmed it, they spent the money, they're gonna use it. Sometimes the pilot might even show up later!
Not a fan of Buffy to start with (I mean, I never watched it, it might be awesome but I don't know) so I won't read the pilot script, but I wouldn't condemn fans for wanting to know. I suspect even if the pilot is bad, the Buffy fans will still be there for the show if it does get picked up. I think she's selling Buffy fans short. They're a very vocal bunch, and reading an early manuscript of an unaired pilot is not going to scare them off.