How do I clean up packages that have been purged that are still showing up on "apt get update" command?

I am still learning linux and have been running into a slight issue with my Raspbian OS system. I have uninstalled software like docker and vs code to clear up memory for my OMV NAS; however, they still show up when I run apt-get update. To be clear, everything is functioning properly. I have already tried the following commands: apt-get clean, apt-get autoremove, and reboot. I would like to clean up this part if at all possible. Cheers!