PlatformDestroyer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlatformDestroyer : MonoBehaviour
{
    // This variable will store a reference to the GameObject itself
    public GameObject platformDestructionPoint;

    // Start is called before the first frame update
    void Start()
    {
        // Instead of using GameObject.Find, simply assign the GameObject to the variable
        platformDestructionPoint = this.gameObject;

        // Check if the GameObject reference is null (This is less likely to happen now)
        if (platformDestructionPoint == null)
        {
            Debug.LogWarning("PlatformDestructionPoint reference is null.");
        }
    }

    // Update is called once per frame
    void Update()
    {
        // Check if the PlatformDestructionPoint GameObject is found before accessing its position
        if (platformDestructionPoint != null && transform.position.x < platformDestructionPoint.transform.position.x)
        {
            // Disable the GameObject instead of destroying it
            gameObject.SetActive(false);
        }
    }
}