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<?php

// WooCommerce - Exclude Products from Shop Page using IDs.
// =============================================================================

add_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

function custom_pre_get_posts_query( $q ) {

  if ( ! $q->is_main_query() ) return;
  if ( ! $q->is_post_type_archive() ) return;
  
  if ( ! is_admin() && is_shop() ) {

    $q->set( 'post__not_in', array(70, 53) ); // Replace 70 and 53 with your products IDs. Separate each ID with a comma.
  
  }

  remove_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

}