News flash: Sergey now thinks that his working so closely on Google+ was a mistake.

Now that it's publicly dead in the water sure. But saying anything negative about your own products while they're still trying to push it as the next big thing? It'll never happen. Any executive that tried would be fired or sidelined. Public comments like that are purely a matter of marketing and PR, individuals (particularly senior ones) will always back the company message.

This is why you never hear anything from Microsoft other than Windows8 is great! Or alternatively, you never hear anything from Apple at all. It's the PR department's job, not the senior execs.