If i remember correctly, now hardware is called an Amiga. There is the AmigaOne. And there is OS4, together you coudl argue that this makes up an Amiga.
But according to the tradmark (i guess thats a description that the owner appends to it, therefor its able to be changed) Amiga has nothing to do with hardware. Only software.
So really, AmigaOnes and OS4 isnt an Amiga, its an AmigaOne and AmigaOS4. Those tradmarks may still be active...