I assume it isn’t, because they apparently made a change to facilitate this.
July 2021:
“There is at the time no way to uninstall MicroG due to technical reasons, we may implement the possibility to do it one day.” … https://community.iode.tech/t/uninstall-microg/103/2
November 2021:
“You are free to uninstall MicroG” … https://community.iode.tech/t/is-iodeos-a-degoogled-os/218/2