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Re:Why the “WhatsApp-backdoor” is not a WhatsApp-backdoor by rocqua on Friday January 13, 2017 @09:10AM (#13390850)
The paragraph is correct but misses the point.

Whatsapp will re-transmit messages with a key provided by whatsapp without ever giving the user the option to verify that key. Even with the opt-in, the message will be re-transmitted. All the opt-in ensures is that you are notified of the key change (a notification you receive after the message has already been re-transmitted under the new key)

Re:Why the “WhatsApp-backdoor” is not a WhatsApp-backdoor by slashcrypto on Friday January 13, 2017 @09:26AM (#13390982)
I edited this part, you are definitely right.