Set AsyncOperation.allowSceneActivation from another script ?

if you need any help leave a comment below so basically i have a separate scene (loading scene) which has the below script attached to it

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.SceneManagement;
 
 public class LoadingSceneController : MonoBehaviour {
     
     [Header("Loading Visuals")]
     public Image background;
     public Image progressBar;
     public Image fadeOut;
     public Text loadingText;
     [Header("Timing Settings")]
     public float waitOnLoadEnd;
     [Header("Loading Settings")]
     public ThreadPriority loadThreadPriority;
 
     AsyncOperation operation;
 
     public static int loadingSceneIndex = 1;
     public static string sceneNameToLoad = "";
     public static int sceneIndexToLoad = -1;
 
     void Start()
     {
         GetComponent<AudioSource> ().volume = Volume_Controller.get_sfx_volume();
         Debug.Log (sceneNameToLoad);
         Debug.Log ("Loading scene is loaded");
         StartCoroutine (CoLoadSceneAsyncByName ());
     }
     public static void LoadSceneByName(string sceneName)
     {
         Application.backgroundLoadingPriority = ThreadPriority.High;
         SceneManager.LoadScene(loadingSceneIndex);
         sceneNameToLoad = sceneName;
     }
     public static void LoadSceneByIndex(int sceneIndex)
     {
         Application.backgroundLoadingPriority = ThreadPriority.High;
         SceneManager.LoadScene(loadingSceneIndex);
         sceneIndexToLoad = sceneIndex;
     }
     IEnumerator CoLoadSceneAsyncByName()
     {
         InitializeVisuals ();
         yield return null;
 
         Application.backgroundLoadingPriority = loadThreadPriority;
 
         operation = SceneManager.LoadSceneAsync (sceneNameToLoad);
 
         while (!operation.isDone) 
         {
             progressBar.fillAmount = operation.progress;
             yield return null;
         }
         yield return new WaitForSeconds (waitOnLoadEnd);
 
         LoadingDone ();
 
         yield return new WaitForSeconds (0.1f);
         operation.allowSceneActivation = true;
     }
     public void InitializeVisuals()
     {
         progressBar.fillAmount = 0f;
         loadingText.text = "Loading...";
     }
     public void LoadingDone()
     {
         progressBar.fillAmount = 1f;
         loadingText.text = "Loading Done.";
     }
 
 }