That's not what this is, you still have 100% liability for any data that touches your software or is on your servers. (Any lawyer will tell you that liability, particularly the egregious, criminal kind, cannot be contracted away in the United States.) What Google is saying is that for some of its APIs, the data you send will be operated on in a HIPAA compliant environment. But understand that if Google's HIPAA environment somehow fails in an egregious manner, you would still be liable.
All that said, the likelihood of the failure being on Google's end is remote, in the extreme. If there is a failure, it's far more likely to be on your side. In your servers where you hold the data, or where the data is being processed by you, or maybe you displayed the data to someone you shouldn't have or something like that. Very unlikely to be Google given the, I believe intentionally, limited touchpoints they have on the data.