alt Hacker NewsIf I can log into whatsapp on a new device and old messages aren’t encrypted then they have a copy of your key and it is not true e2e encryption.
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Mordisquitos • today at 4:14 PM
Try logging in on a new device and putting your main device into aeroplane mode as soon as the login succeeds. Loading of old messages on the new device will stop.
You can't unless you've chosen to back up your WhatsApp messages to iCloud/Google in which case it's Apple/Google responsible for preserving the messages and subject to their encryption standards, nothing to do with Meta.