The article does state that, but there's zero evidence backing it. It also doesn't help that said experts are from Oracle, which aren't really the most unbiased source when it comes to Google news.
Well, that's kind of my point. Yes, you could hypothetically transmit 1 GB/month batched to use wifi, but the article in question is saying it's using your mobile data (to sow FUD). There is no evidence that Google is sending 1GB/month of data over wifi either.