Cannot understand how to open a simple TWA inside an app (using AndroidX)

I am trying to open a TWA inside my app and have researched for 2 days.

I've already managed to create a single TWA app, no fuss, just edit the manifest and a few things more.

Now I need to have my own app - let's say the app has a splash screen activity at first which then opens the TWA inside the app. Can I launch a TWA inside my app through a simple splash screen activity, for example?

I did try to use CustomTabs way, but it says it is deprecated and to use TrustedWebActivityIntentBuilder instead, but there is 0, I repeat, ZERO documentation on how to use that!

Android development documentation is horrible. Among other things, the documentation pointers are out-dated. (Read videos on their channel linking to guides that are no longer valid for what is discussed in the video itself)

The closest thing I found was this sample project. This uses a shocking number of deprecated things rendering the adaptation of that method into my app completely useless. It also makes use of a countless number of custom Classes/Helpers created just for that project, leading me to a never ending marathon of copy-pasting each one of them just to find out that inside that one there are more that need to be copied over to the project.

After a lot of trial and error as always I've managed to launch a TWA inside the app. Note that this is not like a WebView, it merely starts an activity on your app's stack.

The following is in my Activity's code:

final static String PACKAGE_NAME = "com.android.chrome";
final static String BASE_URL = "https://your.website.com";
CustomTabsClient mClient;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_launcher);

    CustomTabsClient.bindCustomTabsService(this, PACKAGE_NAME, getConnection(BASE_URL));

}

private CustomTabsServiceConnection getConnection(final String url) {

    return new CustomTabsServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName componentName) {
            mClient = null;
        }

        @Override
        public void onCustomTabsServiceConnected(
            ComponentName name,
            CustomTabsClient client
        ) {

            final Intent intent;
            final CustomTabsSession customTabsSession;
            final TrustedWebActivityIntentBuilder intentBuilder;

            mClient = client;
            mClient.warmup(0);

            if ((customTabsSession = mClient.newSession(new CustomTabsCallback())) == null) {
                return;
            }

            intentBuilder = new TrustedWebActivityIntentBuilder(Uri.parse(url))
                .setToolbarColor(Color.parseColor("#ffffff"))
                .setNavigationBarColor(Color.parseColor("#ffffff"));

            intent = intentBuilder.build(customTabsSession);

            startActivity(intent);

        }

    };

}