Trying to upgrade from Odoo 14 to 16.

I have a module that is not compatible for 16, yet not needed.  So I am trying to uninstall it before upgrading.

But try as I might during the upgrade the module persists.  And errors occur.

I've recently been told (I think incorrectly) that a custom module requires an upgrade, and can never be uninstalled.

Is there a way to remove custom modules before upgrade?  If so what is the proper way to do it?

Here is a video of the issue.  https://photos.app.goo.gl/p7bBeECqddsMV62DA

Thank you in advance for any help.