Reading time outputting % minutes for all posts

Hi, thank you for this life saving plugin!

I am using the shortcode within a small soliloquy plugin addon which is causing it to output 5 minutes for all posts. Does some variable need to be passed into this plugin to read the rt_reading_time? code below. Many thanks.
Frank

<?php
/**
* Plugin Name: Soliloquy - Display Post Age & Read Time
* Plugin URI: https://soliloquywp.com
* Version: 1.0
* Author: Soliloquy Team
* Author URI: https://soliloquywp.com
* Description: Adds the Published Date, Author and Taxonomy Terms for Featured Content slides
*/
 
function sol_soliloquy_fc_date_terms( $content, $post, $data ) {
       
    // Start Config
    $sliderSlugs = array(
        'beauty',
        'fashion',
        'interiors',
        'gloss-live',
        'events',
        'mindourselves',
    );
       
    // Check slider ID is the one we want to amend
    if ( ! in_array( $data['config']['slug'], $sliderSlugs ) ) {
        return $content;
    }
       
    // Build date and taxonomy terms content
    $additional_content =       
    '<div class="soliloquy-fc-date">'
        . __( '', 'soliloquy-featured-content-date-terms' ) . get_the_date( 'dS F Y', $post->ID ) . "<span>" . " BY " . "</span>" . "<br>" . "<span class='slide-author'>" . get_the_author() . "</span>" . ' 
    </div>' .  
     '<div class="read-time">' .  do_shortcode('[rt_reading_time label="" postfix="minute read" postfix_singular="minute read"]') . '</div>';
   
    // Return content
    return  $additional_content . $content;
   
}
add_filter( 'soliloquy_fc_caption', 'sol_soliloquy_fc_date_terms', 1, 3 );

The page I need help with: [log in to see the link]