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Since /data is used as path alias for a node, Drupal shows that node instead of using any route that a module defines for /data. If you were to set a node path alias to /admin/config/people/accounts, Drupal won't show the accounts setting page anymore.

If you want to change the render array used for a node, you need to implement hook_ENTITY_TYPE_view(). You can compare $entity->id() with the node ID to which you want add data in its render array.

use \Drupal\Core\Entity\EntityInterface;
use \Drupal\Core\Entity\Display\EntityViewDisplayInterface;

/**
 * Implements hook_ENTITY_TYPE_view().
 */
function mymodule_node_view(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display, $view_mode) {
  if ($entity->id() == 3) {
    // Change $build.
  }
}