Where to get Angry Birds Hollydays?

Hallo

Where can i get the App Angry Birds Hollydays?

In the google playstore, there is a message, that it´s not released jet (wired, because i saw infos about it, from the year 2017).

If i search for apk, i find pages, ther show the title and the app-icon, but the lonks lead to an akk for an uncommon appstore.

Why i cannot find the game, itself?