[Google Pixel 2 XL Themes, Apps, and Mods] Tulsadiver:
Here's the guide:

Decompile your SystemUIGoogle.apk.

Find your status_bar.xml in the res/layout folder.

Open with notepad++ and go near the bottom and find this code

<ViewStub android:id="@id/emergency_cryptkeeper_text" android:layout="@layout/emergency_cryptkeeper_text" android:layout_width="wrap_content" android:layout_height="fill_parent" />

Immediately after that code insert this:

<include layout="@layout/Invpower" />

The entire modded status_bar.xml will look like this:

<?xml version="1.0" encoding="utf-8"?>
<com.android.systemui.statusbar.phone.PhoneStatusBarView android:orientation="vertical" android:id="@id/status_bar" android:background="@drawable/system_bar_background" android:focusable="false" android:descendantFocusability="afterDescendants" android:layout_width="fill_parent" android:layout_height="@dimen/status_bar_height" android:accessibilityPaneTitle="@string/status_bar"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui">
<ImageView android:id="@id/notification_lights_out" android:paddingBottom="2.0dip" android:visibility="gone" android:layout_width="@dimen/status_bar_icon_size" android:layout_height="fill_parent" android:src="@drawable/ic_sysbar_lights_out_dot_small" android:scaleType="center" android:paddingStart="@dimen/status_bar_padding_start" />
<LinearLayout android:orientation="horizontal" android:id="@id/status_bar_contents" android:layout_width="fill_parent" android:layout_height="fill_parent" android:paddingStart="@dimen/status_bar_padding_start" android:paddingEnd="@dimen/status_bar_padding_end">
<ViewStub android:id="@id/operator_name" android:layout="@layout/operator_name" android:layout_width="wrap_content" android:layout_height="fill_parent" />
<FrameLayout android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0">
<include layout="@layout/heads_up_status_bar_layout" />
<LinearLayout android:id="@id/status_bar_left_side" android:clipChildren="false" android:layout_width="fill_parent" android:layout_height="fill_parent">
<com.android.systemui.statusbar.policy.Clock android:textAppearance="@style/TextAppearance.StatusBar.Clock" android:gravity="start|center" android:id="@id/clock" android:layout_width="wrap_content" android:layout_height="fill_parent" android:singleLine="true" android:paddingStart="@dimen/status_bar_left_clock_starting_padding" android:paddingEnd="@dimen/status_bar_left_clock_end_padding" />
<com.android.systemui.statusbar.AlphaOptimizedFrameLayout android:orientation="horizontal" android:id="@id/notification_icon_area" android:clipChildren="false" android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0" />
</LinearLayout>
</FrameLayout>
<android.widget.Space android:gravity="center" android:id="@id/cutout_space_view" android:layout_width="0.0dip" android:layout_height="fill_parent" />
<com.android.keyguard.AlphaOptimizedLinearLayout android:gravity="end|center" android:orientation="horizontal" android:id="@id/system_icon_area" android:layout_width="0.0dip" android:layout_height="fill_parent" android:layout_weight="1.0">
<include layout="@layout/system_icons" />
</com.android.keyguard.AlphaOptimizedLinearLayout>
</LinearLayout>
<ViewStub android:id="@id/emergency_cryptkeeper_text" android:layout="@layout/emergency_cryptkeeper_text" android:layout_width="wrap_content" android:layout_height="fill_parent" />
<include layout="@layout/Invpower" />
</com.android.systemui.statusbar.phone.PhoneStatusBarView>

Open the enclosed Invisible power button zip. Drop the Invpower.xml in your SystemUIGoogle.apk's res/layout folder. Drop the remote_0.png in the res/drawable-xhdpi folder. It is just a blank .PNG file. Recompile because you are done. Getting the mod onto your phone is the tricky part. A vrthemer is your best bet. Once your SystemUIGoogle.apk is recompiled, unzip it with 7zip or similar. You could just flash the status_bar.xml or the whole res folder, classes.dex, and resources.arsc. Unzip the enclosed vrthemer.zip. Copy the contents of the files/folders you just unzipped from your SystemUIGoogle.apk into the vrthemer's vrtheme/system/priv-app/SystemUIGoogle/SystemUIGoogle.apk folder. Zip the vrthemer back up and flash in TWRP.