I have created, inserted the values and run the query as posted in this article and it produces the same result as
SELECT .[ID]
, .[Item]
, .[Price]
, .[OrderDate]
, .[Units]
, .[ShipmentDate]
FROM [#Source]
EXCEPT
SELECT [T].[ID]
, [T].[Item]
, [T].[Price]
, [T].[OrderDate]
, [T].[Units]
, [T].[ShipmentDate]
FROM [#Target] [T]
Still therefore trying to understand the use of the join