On further review, the installer sql code does not include a configuration setting to ensure that plugin check value is incorporated for an upgrade from a pre-2.1.0 version. The error would continue to occur for such a situation until either the database upgrade (no file change necessary) was performed by either doing a fresh install to a database by either removing the existing settings (uninstall script from previous post) or to a store that has not had this plugin previously installed or by executing a query that would specifically add the setting present currently in the init file. This is something to be addressed in the next version.

Specifically why? It was a mistake/oversight of my doing.