It's not about access to information. It's about removing the possibility of being confused for a spokesperson of Google's. This is in contrast to comments you

It's not about access to information. It's about removing the possibility of being confused for a spokesperson of Google's. This is in contrast to comments you see here like "hi, Ben Foobar from [company being discussed] here", where the company is being formally represented and communicating with HN. Naturally Google doesn't engage this way on HN, but the disclaimer is written out of habit and an abundance of caution.