Envirodefence,
It looks like you need to do a meta_query in your get_posts() function. You can find the docs here: https://www.advancedcustomfields.com/resources/query-posts-custom-fields/. Look under the Custom Fields advanced section for an example on how to query a checkbox. Essentially, you will add a query field like so:
'meta_query' => array(
'key' => 'featured_type',
'value' => 'about',
'compare' => '=',
),
),
