> Ex-WhatsApp engineer here. WhatsApp team makes so much effort to make this end to end encrypted messages possible. From the time I worked I know for sure it is not possible to read the encrypted messages.

None of this makes the point you want to make. Being a former engineer. The team making "so much effort". You "knowing for sure". Like many in security, a single hole is all it takes for your privacy to pour out of your metaphorical bag of sand.