Difference with nolock and readpast in SQL server 2016 - sql

Question

I am updating a table Hr.employees for a single record in a transaction in one query window
Begin Tran A
update hr.Employees
set lastname = 'davis'
where empid=1
In other query window i am running two select statements without a transaction
select count(*) from hr.Employees with(nolock)
select count(*) from hr.Employees with(readpast)
Both of them returning 9, whereas readpast should return 8 as it removes dirty read when returning data.
CREATE TABLE [HR].[Employees](
[empid] [int] IDENTITY(1,1) NOT NULL,
[lastname] [nvarchar](20) NOT NULL,
[firstname] [nvarchar](10) NOT NULL,
[title] [nvarchar](30) NOT NULL,
[titleofcourtesy] [nvarchar](25) NOT NULL,
[birthdate] [datetime] NOT NULL,
[hiredate] [datetime] NOT NULL,
[address] [nvarchar](60) NOT NULL,
[city] [nvarchar](15) NOT NULL,
[region] [nvarchar](15) NULL,
[postalcode] [nvarchar](10) NULL,
[country] [nvarchar](15) NOT NULL,
[phone] [nvarchar](24) NOT NULL,
[mgrid] [int] NULL,
CONSTRAINT [PK_Employees] PRIMARY KEY CLUSTERED
(
[empid] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [HR].[Employees] WITH CHECK ADD CONSTRAINT [FK_Employees_Employees] FOREIGN KEY([mgrid])
REFERENCES [HR].[Employees] ([empid])
GO
ALTER TABLE [HR].[Employees] CHECK CONSTRAINT [FK_Employees_Employees]
GO
ALTER TABLE [HR].[Employees] WITH CHECK ADD CONSTRAINT [CHK_birthdate] CHECK (([birthdate]<=getdate()))
GO
ALTER TABLE [HR].[Employees] CHECK CONSTRAINT [CHK_birthdate]
GO
CREATE NONCLUSTERED INDEX [idx_nc_lastname] ON [HR].[Employees]
(
[lastname] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
CREATE NONCLUSTERED INDEX [idx_nc_postalcode] ON [HR].[Employees]
(
[postalcode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO