It's a little unclear what was actually compromised in this if it was just what was available WhatsApp on their end that's definitely an easy way. If it's more

It's a little unclear what was actually compromised in this if it was just what was available WhatsApp on their end that's definitely an easy way. If it's more that WhatsApp was being used to read more data from the phone than what had already been sent via WhatsApp (or if WhatsApp doesn't have access to things sent because it's E2E encrypted) it'd require something more complex than that.