Why can't i delete the app history ?

[AC Question]

When i go to Google+ settings and press "Manage apps and +1' s on posts", i see all the apps that have been installed and i don't have anymore on my phone...I delete the activities and have disconnected them but they are still there...

 

[Almeuit]

I don't think Google removes app history .. At least it never has from my PlayStore or anything.