Well, I for one can place calculator in my Objectdock, so its not hijacking. Since you are not able to provide assistans maybe I can help him. He just bought it and this community could bring some help, even if Stardock staff only answer with ignorant "Not supported".
And as you can see I also have Whatsapp. Some apps might need an extra step to get the icon, but overall it works just fine in Windows 11 enviroment.