Magento 2 cannot delete module bceause ClassReader.php class not found - magento2

Question

Magento 2.3.3
I have the module Swissup/Core installed. I had some problems and removed it. After I removed the module, (deleted from composer directory) I can no longer use Magento 2. I get the following when trying to run any commands.
Updating modules:
Class Swissup\Core\Console\Command\ModuleCommand does not exist
In ClassReader.php line 19:
Class Swissup\Core\Console\Command\ModuleCommand does not exist
I checked and there is no attribute created by this module. I checked source_model, frontend_model, backend_model.
I removed all references to the module in composer.json, composer.lock.
I removed all references to it in composer files in vendor directory.
I removed cache, pub/static, generated, and var/cache.
I also did a recursive search across the entire site for any file containing the word swissup or Swissup. None were found.
I also removed the module from the setup table.
I also checked/removed any reference in core_config_data
Still, I cannot use the system and this error persists.
I cleared all composer cache
I also as a test, put invalid credentials in app/etc/env.php to see if the database would cause an issue, but it didn't, I still get this error.
I don't understand, how, if i'm sure by doing a grep in every file a part of Magento and no such reference exists, that this error is raised. There must be some file stored outside of the Magento filesystem. It cannot be a database issue, because the database cannot connect due to me inputting invalid values.

Answer 1

I highly recommend you delete Modules by first running bin/magento module:disable Vendor_Namespace followed by composer remove vendor/package instead of deleting it in the file system.
Do you have a git repository on which you can reset? Does composer install generate any errors?

Answer 2

This can happen if there is the module entry in the setup_module table.
If the module you want to delete is Vendor_Module, then search for the module in setup_module table:
SELECT * FROM setup_module WHERE module = "Vendor_Module";
If you find the module in setup_module table, then you need to remove that from the table:
DELETE FROM setup_module WHERE module = "Vendor_Module";