Как обновить recyclerview, который удалил все данные

Я перехожу с SQL на ORM Room. Я следил за учебником, обычно он работал с вставкой данных, но когда я удаляю элемент, он не исчезает. Мне нужно открыть и закрыть приложение, чтобы показать, что оно исчезло.

Учебник, которому я следовал, выглядит так: https://medium.com/@anujguptawork/note-making-application-using-sqlite-vs-room-part-2-using-room-becf92672e29

public class MainActivity extends AppCompatActivity implements Contrato.MainViewInterface {

@BindView(R.id.recyclerHome)
RecyclerView recyclerView;

private HomeAdapter adapter;
private List<Clientes> clientesList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    ButterKnife.bind(this);

    initViews();
    loadNotes();
}

private void initViews() {

    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    recyclerView.setHasFixedSize(true);
}

private void loadNotes(){
    ClienteRepository.getInstance(this).getNotes(this);
}

@OnClick(R.id.fabAdicionar)
public void addNote(){
    Intent i = new Intent(MainActivity.this, AdicionarActivity.class);
    startActivity(i);
}

@OnClick(R.id.buttonDeletar)
public void buttonDeletar(){
    ClienteRepository.getInstance(this).deletarNotes();
}

@Override
public void onNotesLoaded(List<Clientes> clientesList) {
    clientesList = clientesList;

    if (clientesList.size() == 0){
        onDataNotAvailable();
    }else {
        adapter = new HomeAdapter(this, clientesList);
        recyclerView.setAdapter(adapter);
    }
}


@Override
public void onDataNotAvailable() {
    Toast.makeText(this,"Adicione uma nota",Toast.LENGTH_SHORT).show();
}

}

public class ClienteRepository {
private Context context;
private static ClienteRepository _instance;
private ClienteRoomDatabase db;

public static ClienteRepository getInstance(Context context) {
    if (_instance == null) {
        _instance = new ClienteRepository(context);
    }
    return _instance;
}

public ClienteRepository(Context context) {
    this.context = context;
    db = ClienteRoomDatabase.getClienteDatabase(context);
}

public void getNotes(final Contrato.MainViewInterface mainViewInterface) {
    db.clienteDAO().getAllClientes().subscribeOn(Schedulers.io()).observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<List<Clientes>>() {
        @Override
        public void accept(List<Clientes> notes) throws Exception {
            mainViewInterface.onNotesLoaded(notes);
        }
    });
}

public void addNotes(final Contrato.AddNoteViewInterface addNoteViewInterface, final String nome) {
    Completable.fromAction(new Action() {
        @Override
        public void run() throws Exception {
            Clientes clientes = new Clientes(nome);
            db.clienteDAO().insert(clientes);
        }
    }).observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io()).subscribe(new CompletableObserver() {
        @Override
        public void onSubscribe(Disposable d) {
        }

        @Override
        public void onComplete() {
            addNoteViewInterface.onNoteAdded();
        }

        @Override
        public void onError(Throwable e) {
            addNoteViewInterface.onDataNotAvailable();
        }
    });
}

public void deletarNotes() {
    Completable.fromAction(new Action() {
        @Override
        public void run() throws Exception {
            db.clienteDAO().deleteAll();
        }
    }).observeOn(AndroidSchedulers.mainThread())
            .subscribeOn(Schedulers.io()).subscribe(new CompletableObserver() {
        @Override
        public void onSubscribe(Disposable d) {
        }

        @Override
        public void onComplete() {
        }

        @Override
        public void onError(Throwable e) {
        }
    });
}

}

@Dao
public interface ClienteDAO {

@Insert
void insert(Clientes clientes);

@Query("DELETE FROM table_clientes")
void deleteAll();

@Query("SELECT * FROM table_clientes ORDER BY name ASC")
Maybe<List<Clientes>> getAllClientes();
}