Plugin no longer works | WordPress.org

I’ve been using the plugin to replace the preset comments title (One thought on/X thoughts on . . .) to simply “Comments & Pingbacks” (see screenshot and relevant code from the theme below). But I’ve recently discovered that the plugin is no longer working, even though I didn’t touch it since I set it up a while back. I activated the plugin (and only it) in troubleshooting mode and it still didn’t work. I’d appreciate any help with the issue!

        <?php
            printf( // WPCS: XSS OK.
                esc_html( _nx( 'One thought on &ldquo;%2$s&rdquo;', '%1$s thoughts on &ldquo;%2$s&rdquo;', get_comments_number(), 'comments title', 'colinear' ) ),
                number_format_i18n( get_comments_number() ),
                '<span>' . get_the_title() . '</span>'
            );
        ?>