Two excerpts fields

1) One quick way to do this is to trim the excerpt specifically on the home page, something like this in your functions.php file:

add_filter( 'nooz_post_data', function( $post_data ) {
    if ( is_front_page() ) $post_data['excerpt'] = wp_trim_words( $post_data['excerpt'], 10, '...' );
    return $post_data;
} );

2) However if you want specifically different excerpts for home vs everywhere else you can enable ‘custom-fields’ for press releases/coverage and create a custom field. In the example below you could add a new custom field named my_alt_excerpt which is only used on the front-page. Something like this in your functions.php file:

add_filter( 'nooz/post-types/nooz_release/options', 'my_enable_custom_fields' );
add_filter( 'nooz/post-types/nooz_coverage/options', 'my_enable_custom_fields' );
function my_enable_custom_fields( $options ) {
    $options['supports'][] = 'custom-fields';
    return $options;
}

add_filter( 'nooz_post_data', function( $post_data ) {
    if ( ! is_front_page() ) return $post_data;
    global $post;
    $alt_excerpt = get_post_meta( $post->ID, 'my_alt_excerpt', TRUE );
    $post_data['excerpt'] = $alt_excerpt ?: wp_trim_words( $post_data['excerpt'], 10, '...' );
    return $post_data;
} );

My recommendation would be option #1, this is because only one excerpt needs to be created and maintained.

Option #2, allows for custom secondary excerpts but will also fallback to the default excerpt if a secondary excerpt is not present.