Instead of a custom loop, use actions and filters to change the output.

custom-single.php

<?php
// Reply to post: https://www.facebook.com/groups/genesiswp/permalink/2653424794708701/

remove_action( 'genesis_entry_header', 'genesis_do_post_title' );
remove_action( 'genesis_entry_footer', 'genesis_post_meta' );
//* Remove site footer widgets
remove_action( 'genesis_before_footer', 'genesis_footer_widget_areas' );


add_filter( 'genesis_post_info', 'dcwd_post_info' );
function dcwd_post_info( $post_info ) {
	// $post_info = '[post_date] ' . __( 'by', 'genesis' ) . ' [post_author_posts_link] [post_comments] [post_edit]';
	return '[post_date]';
}


add_action( 'wp_enqueue_scripts', 'dcwd_add_font_awesome_4' );
function dcwd_add_font_awesome_4() {
	wp_enqueue_style( 'fa4', 'https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css' );
}


//* Add custom body class to the head
add_filter( 'body_class', 'single_posts_body_class' );
function single_posts_body_class( $classes ) {
	$classes[] = 'custom-single';
	return $classes;
}


add_action( 'genesis_before_loop', 'dcwd_add_article_div' );
function dcwd_add_article_div() {
?>
<div class="article"></div>
<?php
}


add_action( 'genesis_before_entry', 'dcwd_blogpost_div_and_featured_image' );
function dcwd_blogpost_div_and_featured_image() {
?>
<div class="blogpost">
<div class="img">
<?php $largeimage = get_field('larger_featured_image');
if( $largeimage ){ ?>
<img src="<?php echo $largeimage; ?>" class="aligncenter" alt="<?php the_title(); ?>" />
<?php
} else {
	the_post_thumbnail();
}
?></div>
<?php
}


add_action( 'genesis_entry_header', 'dcwd_author_avatar' );
function dcwd_author_avatar() {
?>
<span class="authorarea"><span class="avatar"><?php echo get_avatar( get_the_author_meta('email'), '60' ); ?></span>By: <?php the_author_posts_link(); ?></span>	
<?php
}


add_action( 'genesis_before_entry_content', 'dcwd_title_and_categories' );
function dcwd_title_and_categories() {
?>
<div class="headingarea">
<h1><?php the_title(); ?></h1>
<?php
$categories = get_the_category();
if ( ! empty( $categories ) ) {
	echo '<i class="fa fas fa-angle-double-right"></i><a href="' . esc_url( get_category_link( $categories[0]->term_id ) ) . '">' . esc_html( $categories[0]->name ) . '</a>';
} ?>
<span class="redline"></span> </div>
<?php
}


add_action( 'genesis_after_entry', 'dcwd_post_navigation' );
function dcwd_post_navigation() {
	the_post_navigation();
	echo '</div>';  // Close <div class="blogpost">
}


//* Run the Genesis loop
genesis();