WooCommerce, disable shipping methods based on email

Question

I'm trying to disable shipping methods based on the customer's email in the checkout page. My state code validation works but not my email validation. When I type the testing email in the textfield it updates the cart total where the shipping methods are but they're not being hidden. What am I doing wrong on the email part?

This is the state code:

add_action( 'woocommerce_package_rates', 'validate_state', 100, 2 );
function validate_state( $rates, $package ) {

   $customer_data = WC()->session->get('customer');
   $state = $customer_data['state'];

   if ( $state != "AB" ) {
      unset( $rates['100'] );
      unset( $rates['300'] );
   }

   return $rates;
}

add_action( 'woocommerce_checkout_fields', 'update_field_on_change' );
function update_field_on_change( $fields ) {

   $fields['billing']['billing_state']['class'][] = 'update_totals_on_change';

   return $fields;
}

This is the email code:

add_action( 'woocommerce_package_rates', 'validate_email', 100, 2 );
function validate_email( $rates, $package ) {

   $customer_data = WC()->session->get('customer');
   $email = $customer_data['email'];

   if ( $email != "test@gmail.com" ) {
      unset( $rates['100'] );
      unset( $rates['300'] );
   }

   return $rates;
}

add_action( 'woocommerce_checkout_fields', 'update_field_on_change' );
function update_field_on_change( $fields ) {

   $fields['billing']['billing_email']['class'][] = 'update_totals_on_change';

   return $fields;
}