Oh, the article doesn't quantify what it means by "few." It just throws that idea out there for no reason and then pretends it's a thing.
They did. Wheather that data is accurate is another matter.
What does it matter if they were a division of lucasfilm when Steve Jobs became majority shareholder?
Jobs clearly got his money from Apple as well as polishing his stills. So, really if Nest qualifies then clearly Pixar does as well.
PS: IMO, it would be reasonable not to include Nest as an Apple startup, but if one qualifies then clearly the other does as well.