I'd argue it still counts as contribution to curtailment of the mentioned rights.
As it was mentioned before, presence of Google will add legitimacy to the practice of censorship in China (and not only in China).
My toy conspiracy theory is that China is inviting foreign giants on its own terms to deface them. That in turn will level appearance of their products with those of Chinese companies in some global markets (e.g. b2b software).
Do they actually care about such rights? I've read somewhere that there are mobs for things such as fairness, where people will even take justice in their own hands if the courts don't do their job, yet the Chinese for the most part don't care about freedom in the Western sense.
Why is it that more people seem to get riled up over a lady killing a cat with her heels, as in the horrifying event of a decade ago, than censorship of over a billion people? It's not exactly a secret.
Yes, the presence of Google might add a bit of legitimacy to censorship outside China, the slippery slope which is to me the real danger. Inside the country, though, I doubt it would make any difference. I have a hard time imagining millions or even just thousands waiting for Google to come in and... do what? Show uncensored results, only to get summarily blocked within minutes? I'd be surprised if there were that large of a group whose opinions would be swayed by what Google does or does not do. Or that they're ready to start protesting, only to be discouraged at the last minute by this new censored search engine. You'd think that by now you would have heard about them.
Their internet is already censored. This is the question of whether Baidu is doing the censorship of search results or Google is.