To put it bluntly, he was the employee of a company that Google hired to do some work for them and he was bothering employees and then he become someone else's

To put it bluntly, he was the employee of a company that Google hired to do some work for them and he was bothering employees and then he become someone else's problem up the chain and it then become his direct employer's problem who value their contract and the employment of their other employees over the personal project and whims of someone who was hired to do some film work and not to conduct an investigation into the socio-economic makeup of the campus. Now that he's no longer employed, he can go ahead with his pursuit without doing it under the advantage of his employment or his employer and I'm sure that if his insinuations are remotely true, then there are sure to be a bunch of people beating down his door for the opportunity to speak with him about their work at Google, under journalistic protection.