Override the Advanced Setting to hide excerpts if this is 'page' post type in Paid Memberships Pro.

option_pmpro_showexcerpts_on_pages.php

<?php
/*
 * Override the Advanced Setting to hide excerpts if this is 'page' post type.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 *
 */
function option_pmpro_showexcerpts_on_pages( $showexcerpts ) {
	global $post;
	if ( ! empty( $post ) && $post->post_type == 'page' ) {
		$showexcerpts = true;		
	}
	return $showexcerpts;
}
add_filter( 'option_pmpro_showexcerpts', 'option_pmpro_showexcerpts_on_pages' );