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I managed to do what I wanted, I just got all posts, printed out the ones with categories, and the rest treated as uncategorized.

On the Codex:

Custom Post Type Category (Taxonomy)

If specifying a category from a custom post type then instead of using 'category' you would use '{your_custom_post_type}_category'. For instance, if you had a custom post type called "dogfood" and wanted to only show posts from the category "brand" you would use the below code.

If I only use ‘category’ => $term->slug , it returns nothing.

Got it working.

Oh, silly me. Just found out I need only to [gallery]…

I don’t want to enable WP shortcodes, I want to create shortcodes to use inside the description that would output the items contents.

In other words, dismiss the usage of a template file and just call, for example, %IMAGE-THUMBNAIL% as if it was a shortcode.

Ex:

my description is very long. But check out my images:
  [IMAGE-THUMBNAIL]

  cool images, right? So here we continue with my description.

Looking in the code I found this:

// loop through each items array of values and replace tokens
		foreach($values as $key => $value) {
			$search  = "%" . strtoupper($key) . "%";
			$template  = str_replace($search, $value, $template);
		}

Can I just create a new loop and create a shortcode for each value?
I actually just need a shortcode for the subimages, and videos after available.

That isn’t the case. I solved the problem by using the plugin “Mindvalley Post & Get Variables”, I modified it to check if catablog-items $_GET var is set, meaning that it’s being visualized on it’s own page(not in a post).

Basically this:

$key = 'catablog-items';
		if($pos = strpos($key,'[')){
			$basekey = substr($key,0,$pos);
			$remainder = substr($key,$pos);

			eval('$value = $_GET[' . $basekey . ']' . $remainder . ';');
		}else{
			$value = $_GET[$key];
		}

        if(!empty($value) && is_string($value)){	// is_string() to avoid unnecessary warnings if key is an array
			return $content;
        }

Then just call it:

[ExclusiveContent] can only see me when going to permalink
[\ExclusiveContent]