I think that sentence only applies to a display. The iMac has a display included, so that might be why the it was not included.
Just a guess though.
The first part of that covers only the computers mentioned because it is about covering the "Covered Equipment" (i.e., the computers mentioned) plus a display if purchased with the Mac. You wouldn't buy one with an iMac because it already has one.
The second part talks about keyboards. They are covered if they come with the equipment (the Mac under warranty).
The third part talks about various Airport and similar devices. They are covered if you own them and they are being used with a piece of "Covered Equipment" (i.e., any Mac under AppleCare).
i understand now, thanks for clarifying that. so it appears that the TC is still covered. too bad i have already opened it