I want to hide woocommerce products from the shop loop which the user already puchased

Does that help You don't need to modify Woocommerce template file for what you are trying to achieve. Just add the following code to functions.php

function custom_redirect() {        
    if( is_shop() && ! is_user_logged_in() ) {
        wp_redirect( home_url() ); 
        exit();
    }   
}

add_action("template_redirect","custom_redirect");

it helps some times WooCommerce provides some coarse control over displaying sub categories in your shop/category pages with the “Show subcategories on category pages” and “Show subcategories on the shop page” options on the WooCommerce > Settings > Catalog > Catalog Options section.
These controls are all-or-nothing though: show all subcategories on the category pages, or show all subcategories on the shop page. If you want finer-grained control, for instance displaying only certain subcategories on the shop or particular subcategories on a given category catalog page, you’ll need to write a little custom code, and there are a couple of approaches you can take.

this one helps. Updated: Using a custom function hooked in woocommerce_product_query_meta_query filter hook, targeting non "out of stock" products on shop archive pages only:

add_filter( 'woocommerce_product_query_meta_query', 'shop_only_instock_products', 10, 2 );
function shop_only_instock_products( $meta_query, $query ) {
    // Only on shop archive pages
    if( is_admin() || is_search() || ! is_shop() ) return $meta_query;

    $meta_query[] = array(
        'key'     => '_stock_status',
        'value'   => 'outofstock',
        'compare' => '!='
    );
    return $meta_query;
}

it helps some times I am using the following code to hide the product loop on the Woo shop page: , Change your wc_no_products_found function with this one

add_action( 'woocommerce_no_products_found', function(){

 if(is_shop()) {
    remove_action( 'woocommerce_no_products_found', 'wc_no_products_found', 10 );
}
}, 9 );

To fix the issue you can do I checked your website. Add this to Custom CSS to hide the categories of products on shop page:

a.cmsmasters_cat_color {
     display: none;
}