What can we say about users of WhatsApp? What sApps!
As for what they say about how they do or don't use the data, they probably do not interpret those words in the same way a non-lawyer would. Also, the FBI can demand all that data at any time without a warrant by means of the PAT RIOT Act, and it has no obligation to follow WhatsApp's policies at all.
Research sourced from stallman.org.