Success! Thank you so much. Just these little things, that once known, it’s “oh, of course”. Now I know. Thanks, as always, for the great support.
Here’s the code for anyone else on here that may have run into the same issue.
<?php if( have_rows('testimonial_repeater', 558) ): ?>
<ul>
<?php while( have_rows('testimonial_repeater', 558) ): the_row();
$text = get_sub_field('testimonial_text');
?>
<?php if( get_sub_field('testimonial_type') == 'testimonial_type_workshops' ): ?>
<li>
<?php echo $text; ?>
</li>
<?php endif; ?>
<?php endwhile; ?>
</ul>
<?php endif; ?>
