Counting posts by certain author with custom taxonomy

$args = array(
  'taxonomy' => 'special',
  'posts_per_page' => -1,
  'author' => 2
);

$author_category_posts = new WP_Query($args);

$count_of_posts_by_author = $author_category_posts->post_count;

You can fetch the number of posts made by that author in specific taxonomy.

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