The script is saying exactly what it does. So you just have to revert that.
Simply do the following:
stop services
(thanks @IcyMidnight)
sudo systemctl stop hassio-supervisor.service
sudo systemctl stop hassio-apparmor.service
disable services
sudo systemctl disable hassio-supervisor.service
sudo systemctl disable hassio-apparmor.service
remove services
sudo rm -rf /etc/systemd/system/hassio-supervisor.service
sudo rm -rf /etc/systemd/system/hassio-apparmor.service
removing hassio folders (except the config folder)
sudo rm -rf /usr/sbin/hassio-supervisor
sudo rm -rf /usr/sbin/hassio-apparmor
Now delete the remaining docker images like you always do.
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If you want to delete your Home Assistant config files,
Do the following, but be carefull! Your config is lost forever:
sudo rm -rf /usr/share/hassio/