today I received multiple whatsapp messages from an account called instagram with links to reset my password. I never did request a password reset. I have no Idea if the whatsapp account called instagram was/is instagram, and how to verify.
Likely a bot spamming the reset endpoint to fetch your recovery method hints. Happens all the time. I'd ignore and just sign into your account via the app or website to make sure everything's fine. WhatsApp is indeed used to send reset codes to accounts if the phone number on file is registered to WhatsApp, but I'm unsure as to how that integration actually works, as I don't use WhatsApp.