These are the older videos that have an older web page on them (in the video tutorial )directing to the support classes ie the shooting video tutorial and the explosion videon tutorial all have an old greenfoot webs site layout.
Okay, nevermind; (it doesn't say the URL, it just shows how to get there).
Yes, the video is old and out-of-date.
But you can easily get the support classes at the URL I provided above. Also Greenfoot 2.2.0 will come with several support classes that you can import into your scenarios.