Good point. Here is the full text

>All chats use the same Signal protocol outlined in this whitepaper, regardless of their end-to-end encryption status. The WhatsApp server has no access to the client’s private keys, though if a business user delegates operation of their Business API client to a vendor, that vendor will have access to their private keys - including if that vendor is Facebook.

Not sure if the facebook exception was there in the previous version.

We delete them right after we mirror them to the NSA through our ultra-security SolarWinds box, promise!