How to style archive post titles… but only those posts who have comments?

Use have_comments() function.

Example:

<?php if ( have_comments() ) : ?>

    <h2 class="has-comments"><a href="https://wordpress.stackexchange.com/questions/363222/<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>

<?php else : ?>

    <h2><a href="https://wordpress.stackexchange.com/questions/363222/<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>

<?php endif; ?>

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