NotifDataSetChanged doesnt reload Recyclers Data

gistfile1.txt

override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_rss_news)

        actionBar?.setDisplayHomeAsUpEnabled(true)

        viewManager = LinearLayoutManager(this@RssNewsActivity)
        viewAdapter = RssRecyclerAdapter(this@RssNewsActivity, itemsList)

        recyclerView = findViewById<RecyclerView>(R.id.recyclerView).apply {
            setHasFixedSize(true)
            layoutManager = viewManager
            adapter = viewAdapter
        }

        recyclerSwipe.setOnRefreshListener {
            refreshRssNews()
        }

        refreshRssNews()
    }
    
    
    
    
    private fun refreshRssNews() {
        recyclerSwipe.isRefreshing = true
        RssRequests.rssFeedRequest(object : RequestInterfaces.VolleyCallbackRss {
            override fun onSuccess(string: String) {
                itemsList = RssParser.parseFeed(string)
                recyclerView.adapter = RssRecyclerAdapter(this@RssNewsActivity, itemsList)
                toggleViewsVisibility(false)
                
               // Here notifyDatasetChanged() should work but it does not
               // Instead i make a new Instance of the adatpter
            }

            override fun onError(volleyError: VolleyError) {
                toggleViewsVisibility(true)
            }

        })
    }

class RssRecyclerAdapter(private val activityContext: Context, list: List) :
RecyclerView.Adapter() {

private val articleList: List<Item>

init {
    this.articleList = ArrayList()
    this.articleList.addAll(list)
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RssViewHolder {
    val view = LayoutInflater.from(activityContext)
        .inflate(R.layout.rss_item, parent, false)

    return RssViewHolder(view)
}

override fun getItemCount(): Int {
    return articleList.size
}

override fun onBindViewHolder(holder: RssViewHolder, position: Int) {

    val item = articleList[position]

    holder.title.text = item.title
    holder.description.text = item.description
    holder.pudDate.text = item.pubDate

    Glide.with(activityContext).load(item.media).into(holder.image)

    holder.view.setOnClickListener{

        if (item.link.isEmpty())
            Toast.makeText(activityContext, "URL unavailable", Toast.LENGTH_SHORT).show()

        else {
            val packageManager = activityContext.packageManager
            val uri = Uri.parse(item.link)
            val intent = Intent(Intent.ACTION_VIEW, uri)

            if (intent.resolveActivity(packageManager) != null)
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
                activityContext.startActivity(intent)
        }
    }
}

}