You are in the correct place.
I suspect one of the USER Preferences (in the Calibre configuration folder) for Kobo is damaged.
These are NOT replaced/removed during a remove plugin or even a Calibre uninstall (allows a downgrade), so a reinstall of the plugin will not fix.
If you do delete the device_drivers_KOBOTOUCHEXTENDED.py.json, you will need to redo the settings for the Kobo.
Got Backup of the Config folder? Simply replace (ONLY) the 3 KOBO device files (Calibre NOT running)
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