I don't understand the knee-jerk skepticism. This is something they are doing to gain trust and encourage users to use AI on WhatsApp.
WhatsApp did not used to be end-to-end encypted, then in 2021 it was - a step in the right direction. Similary, AI interaction in WhatsApp today is not private, which is something they are trying to improve with this effort - another step in the right direction.