He is saying data can be access by facebook on your phone since its simply using keychain to store your message and they have access to that keychain. They cou

He is saying data can be access by facebook on your phone since its simply using keychain to store your message and they have access to that keychain. They could theoretically send your entire chat history to facebook. End-to-end encryption does not entail they are not snooping on your phone, just that when the message is sent, it is encrypted.