How this code is accessing injected account service as private in app component's html?

[edgaras87]

Am I missing something?
we are injecting service here as:

export class AppComponent implements OnInit, OnDestroy {
. . .
constructor(private accountService: AccountService, . . .) { }

and then we are using it in app component's html:

Cash: {{accountService.balance | currency:'USD':'symbol':'.2'}}

I getting error that it can't be use as private....