What makes a real Amiga ?

[Bigbronc]

Looking at the web page legal emulation, the requirements are for a real Amiga:
 
http://guide.abime.net/links.htm
 
Requirements
You will need the following to follow this tutorial:

• A real Amiga computer (A500+/A600/A1200)
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• Workbench 2.0+
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• CrossDOS
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• TransROM (comes with WinUAE)
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• Once you have all of the above proceed to the guide.
  

My question is what makes a real Amiga, is my A2000 not real, is there a difference in these computers?