Sensei: Reset all user activity (for all users or specified user)

function.php

<?php
function sensei_reset_activity( $user_id = 0 ) {

    // Get all Sensei activities
    $token = 'sensei_';
    $activities = array( 'course_start', 'course_end', 'lesson_start', 'lesson_end', 'quiz_grade', 'quiz_answers', 'quiz_asked' );
    
    if( 0 < intval( $user_id ) ) {
      $args['user_id'] = intval( $user_id );
    }

    // Loop through all types of comments and delete
    foreach ($activities as $activity ) {
        $args['type'] = $token . $activity;
        $comments = WooThemes_Sensei_Utils::sensei_check_for_activity( $args, true );
        foreach ( $comments as $key => $value  ) {
            if ( isset( $value->comment_ID ) && 0 < $value->comment_ID ) {
                wp_delete_comment( $value->comment_ID, true );
            }
        }
    }
}

For those who are curious how to use this, setting the user_id value:
0 = all users (may take a long time to process depending on how many users, how many courses, lessons and progress activity they are involved with)
1 = admin user (usually)
2 and onward = specific users

One caveat, this didn't work for resetting the Sensei Modules progress indicators which ended up sticking around after I ran the process.

For the time being, I ended up finding the values in the database directly.

They can be found under the wordpress usermeta table with the meta_key starting with "_module_progress" (and some sort of numerical underscored values attached) for a specific user_id just delete that row in the database and it will reset the module progress indicators.