No, the template is not necessarily what created the extra field, but instead what was modified to show it and the information as suspected has been maintained in the template.
Now, I could also be wrong about all that if you said that the current template was just recently installed and you still have access on the site to all previous templates.
Anyways, because the only reference in the entire fileset is in a template file that only retrieves stored data, it would appear that the plugin previously used is not installed now. Here is where you decide to either allow the data to persist and apply a default value or delete the field. If the field is to be deleted, I would recommend restoring the template file back to it's expected state of not including that field. Now on the flip side. Customers may "need" that data still and so it may need to continue to persist... Hopefully you get the idea. :)
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