I am not sure I understand what you’re saying.
If meta can read those messages, then they’re most definitely not e2e encrypted.
Given the historical record, you would be a fool to assume that any service run by a public company isn’t fully tapped by US intelligence agencies. They’ve been tapping anything and everything they can get their hands on, why stop at whatsapp?
Let me flip it around: what proof do you actually have that it is e2e encrypted? Zuckerberg pinky promised?