Index.html content on bootstrap

I am trying to make dynamic splash screen to our Ionic app following this article for angular “splash screen”:

In this article you use the tag in the index.html to put there some loading spinner and then after the app is loaded the index.html is replaced with your app content.

The problem that i faced in Ionic that the index.html content is hidden on the Ionic bootstrap. And my super cool dynamic splash screen cant be shown until the app is bootstrapped.

I maid this project to show the difference between Angular only app loading and Ionic+Angular app loading:

Angular only:
angular-only

Ionic + Angular:
ionic-angular

Can anyone show me the light?