Hand-wavy terms are preferred if the text is end-user facing (and when end-users tend to not be too technical). Of course, a tooltip or "more details" link explaining the real technologies should then be used.
[Firebase founder here] This is one of the nice things about running a company that is 100% developer focused. We can communicate in clear terms with customers that actually understand the nuances of what we're building. We'd much rather be specific than hand-waving.