My interpretation is that they can't do that (if what they say is true). They specifically say that they cannot see the content. This would seem to preclude profiling/summarising the data, because the profiler would have to see the data in the first place.

However, note the differing wording they use: 'WhatsApp cannot see your personal messages or hear your calls' vs 'WhatsApp does not keep logs of who everyone is messaging or calling'. So, are they saying that they do keep logs of who some people are messaging/calling? Maybe they don't log Zuckerberg's usage, but keep everyone else's, and that lets them get away with the weasel words?

Also, what about video calls? They don't mention those, presumably they aren't encrypted and transit through FB/WA servers, allowing them to be viewed/recorded if desired.