I just imported it and it works fine on a pixel 3XL, Pie.
From the description notes when you import the project;
IMPORTANT: Make sure to enable the AutoNotification Notification Listener to make this work. Open Tasker > Menu > More > Android Settings > Notification Listener > Enable AutoNotification.
That is the only configuration that is require.
As long as AutoNotification can intercept notifications that have a "reply" action, the chat head should appear. If not, look in your Tasker run log.
The profile, "Intercept Notifications With Reply Action" contains a default icon for when the notification intercept does not contain an icon that can be used. It's set in A4
A4: Variable Set [
Recurse Variables: Off
Do Maths: Off
Max Rounding Digits: 3
If [ %anicon !Set ]