Blazor identity Manage Profile (Index.razor)

[mnbob70]

    protected override async Task OnInitializedAsync()
    {
        Input ??= new();

        user = await UserManager.GetUserAsync(HttpContext.User);
        if (user is null)
        {
            RedirectManager.RedirectToInvalidUser(UserManager, HttpContext);
            return;
        }

        username = await UserManager.GetUserNameAsync(user);
        phoneNumber = await UserManager.GetPhoneNumberAsync(user);

        Input.PhoneNumber ??= phoneNumber;
    }

Why does OnInitializedAsync retrieve user but then proceed to call UserManager.GetUserNameAsync and UserManager.GetPhoneNumberAsync instead of just using the values assigned to user?

        username = user.UserName;
        phoneNumber = user.PhoneNumber;

I'm going to be adding some additional members to a custom User class for profile editing and noticed this code while working through the changes. I planned to just use the user members directly but now I'm wondering if I'm overlooking something and would need to implement additional Get...Async methods in my custom UserManager to match this implementation.