I'm trying to illustrate that corporations will use weasel language entirely to their advantage.
I have to fight spammers and scammers, I need to be able to inspect message contents. But customers also went into an encryption. So I offer them end to end encryption but I also make a copy for myself. So it's closed source and in public I can just say hey you've got end to end encryption. And be truthful about it, but I also have an administrative side channel where I get a copy of the message.
Or it might be end-to-end encrypted but a copy of the key is preserved for administrative purposes that WhatsApp controls. We just don't know
Weasel language is something we have to defend against, and the only real defense is open source, so we can't trust WhatsApp to protect your end-to-end privacy