When I hear "censorship" I am thinking of government agents sitting in newspaper editorial rooms striking out all statements in an article that does not align with the government's point of view. It means actively suppressing certain kinds of information from being distributed.
What is happening here, looks more like this: a Google employee publishes an email. Lots of people in the company find the content objectionable. Subsequently they decide that they do not want to work with somebody having these opinions. I do not see, how that is even close to censorship. It is not like he has a right to keep that particular job. He can still go out on the street and shout his opinion at the crowd.
Censorship, intimidation & oppression are very strong words to describe a situation, where somebody lost their job, because they wrote an objectionable essay on a company mailing list.
There is a difference between a right to express your opinion, which I support, and a right not to face any resistance or social consequences for voicing that same opinion. The latter of which is made up by the political right trying to relabel it as "free speech".
You can't cry censorship every time you are criticized for something you said. And let's be honest here: white men with regressive points of view are still not particularly threatened of not being heard. After all, they are well represented in pretty much every single powerful institution like parliaments, courts and executive boards. They'll manage to get their opinion heard, I'm afraid.