It's exhausting when everyone wants to make pedantic arguments rather than discuss the topic.
Yeah, absolutely. Like being pedantic about burden of proof, when the topic is actually privacy where the default position is zero trust and it is always on the person claiming to offer privacy or security to prove that they can be trusted.
But sure, let's treat it philosophically instead of practically:
Are they encrypted or are they not? Let's answer the question and then we can have a Socratic debate about it.
They claim to be. That makes them the claimant. The burden of proof thus falls on them. So what proof do they offer for their claim?