Including a custom post type in a category defined array

One of the reasons that I like to use this plugin is that custom post types can easily be associated with the main taxonomy (category) system already in place for posts. However this does not automatically expose the “non-post” content to being shown in an array like this:

But you can specifically show the results of members of the custom post type which are also members of a category by calling out the post type specifically like this:

Or to be more inclusive define the desired group of approved post types by nesting an array within an array like this:

This article was the key for making me understand the array within array nuance.