I noticed a web page referenced in the intro video for the exercises but don't see it references anywhere on the "Flex in a week" page.
The one showned in the video is: http://www.adobe.com/content/dotcom/en/devnet/flex/videotraining/exercises/ex1_02.html
Is it depreciated since the making of the video?
Having a hard time understanding your question. Exactly what web page are you referring to? It would be helpful if you give the title of the video and where in the video the web page is shown.
The link that gave is working. Are you talking about the video that is showing in the exercise?