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Fair. But I would say they have a disincentive to lie about E2E because it’s a selling point of WhatsApp and if they didn’t care they could just roll WhatsApp into Facebook Messenger where there is no promise of E2E.
If E2EE was broken in any app (not just WhatsApp but also Telegram, Signal, iMessage, etc) then someone would have figured that out by now by sniffing the traffic and analyzing the apps in a debugger.