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Core product for whom?

Google+ brings Google valuable information about who you are and what you do to their ad-words (revenue)engine.

Improving a Calendar app which already provides them with that information, brings them little extra.

It's sometimes important to remember who Google's real customers are. It's not you.

Ah yes the Google's real customers meme again.

It hasn't ever had any validity. You are Google's customer as they need you to click on relevant advertisements.

The advertising companies are also their customer. The intention is to hook two customers up together.

Google are matchmakers. How you can twist that into what you posted I don't know.

The blog post is from the Google Apps team. Their customers are people who pay them money for using, among other stuff, Google Calendar.