Custom Text in WooCommerce Order Processing Email Based on Products

Try something like this:

<?php
$order_id = $order->get_id();
$order    = wc_get_order( $order_id );
$items    = $order->get_items();
$is_valid = null;

foreach ( $items as $item_id => $item_data ) {
    $product    = $item_data->get_product();
    $categories = array();

    $terms = get_the_terms( $product->get_id(), 'product_cat' );

    if ( is_wp_error( $terms ) || empty( $terms ) ) {
        continue;
    }

    foreach ( $terms as $term ) {
        if( false !== $is_valid && strtolower($term->name) === 'registration'){
            $is_valid = true;
            continue;
        }

        $is_valid = false;
    }
}

if ( $is_valid ) {
    // Run any html code after this closing php tag -> ?>
    <p>
        Didn't get your gear yet? Click <a href="https://flexfootball.com/shop/">HERE</a> to order yours!
    </p>
<?php // Close "product is a registration form" condition
}

The basic gist is that you are setting up $is_valid as a NULL value. If any category is not registration, then $is_valid becomes boolean false. If the category is registration AND $is_valid is not strictly (!==) false, set $is_valid to boolean true.

Finally, after the loops are done, if $is_valid is true, add the message.

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