I found under the block diagram of https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-wi-fi-plus-bluetooth-combos/cyw43439/ https://www.infineo

I found under the block diagram of https://www.infineon.com/cms/en/product/wireless-connectivity/airoc-wi-fi-plus-bluetooth-combos/cyw43439/ https://www.infineon.com/cms/en/product/wireless-connectivit... Does shows it does have an M4 as you stated, that is for the BT stack.