The options for replaceUrl and skipLocationChange are available in the router's ExtendedNavigationExtras, but they are not being implemented in the PageRouterOutlet. When you try to use either of them

this.routerExtensions.navigate(["/tab"], { replaceUrl: true }) 
//OR
this.routerExtensions.navigate(["/tab"], { skipLocationChange: true })

Navigation fails to skip the a page in the stack, and navigates back to the page that the application was on.

These features would be nice for when an application wants to route to a new page while removing part of the router location history.