How I am checking to make sure I use the same bundle type on a poi_experience_entity as that of the poi_entity it will be referencing

POIExperienceEntityForm.php

<?php

namespace Drupal\destinations\Form;

use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Routing\RouteMatchInterface;

/**
 * Form controller for Point of Interest Experience Entity edit forms.
 *
 * @ingroup destinations
 */
class POIExperienceEntityForm extends ContentEntityForm {
  
  /**
   * {@inheritdoc}
   */
  public function getEntityFromRouteMatch(RouteMatchInterface $route_match, $entity_type_id) {
    $poi_entity = \Drupal::entityTypeManager()
      ->getStorage('poi_entity')
      ->load($route_match->getParameter('poi_entity'));
    
    if ($route_match->getRawParameter($entity_type_id) !== NULL) {
      $poi_experience_entity = $route_match->getParameter($entity_type_id);
    }
    else {
      $entity_type = $this->entityTypeManager->getDefinition($entity_type_id);
      $bundle_key = $entity_type->getKey('bundle');
      $values[$bundle_key] = $poi_entity->bundle();

      //@TODO add in the id of the poi_entity.

      $poi_experience_entity = $this->entityTypeManager->getStorage($entity_type_id)->create($values);
    }
    
    return $poi_experience_entity;
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    /* @var $entity \Drupal\destinations\Entity\POIExperienceEntity */
    $form = parent::buildForm($form, $form_state);

    if (!$this->entity->isNew()) {
      $form['new_revision'] = array(
        '#type' => 'hidden',
        '#title' => $this->t('Create new revision'),
        '#default_value' => TRUE,
        '#weight' => 10,
      );
    } else {
      // We don't need to record a revision message on new Destinations.
      $form['revision_log_message']['#type'] = 'hidden';
    }

    // We never need to manually alter the url alias.
    $form['path']['#type'] = 'hidden';

    $entity = $this->entity;

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function save(array $form, FormStateInterface $form_state) {
    $entity = &$this->entity;

    // Save as a new revision if requested to do so.
    if (!$form_state->isValueEmpty('new_revision') && $form_state->getValue('new_revision') != FALSE) {
      $entity->setNewRevision();

      // If a new revision is created, save the current user as revision author.
      $entity->setRevisionCreationTime(REQUEST_TIME);
      $entity->setRevisionUserId(\Drupal::currentUser()->id());
    }
    else {
      $entity->setNewRevision(FALSE);
    }

    $status = parent::save($form, $form_state);

    switch ($status) {
      case SAVED_NEW:
        drupal_set_message($this->t('Created the %label Point of Interest Experience.', [
          '%label' => $entity->label(),
        ]));
        break;

      default:
        drupal_set_message($this->t('Saved the %label Point of Interest Experience.', [
          '%label' => $entity->label(),
        ]));
    }
    $form_state->setRedirect('entity.poi_experience_entity.canonical', ['poi_experience_entity' => $entity->id()]);
  }

}