Sorry to disappoint, but no.
First, they'd never officially call it a 7D Mark I or anything like that. Second, you're looking at a footnote notation mark, as in 7Di or 7D†, although there's no footnote on the product page. They're marking it to indicate that compatibility with the 7D isn't 'full' in that with the 7D, you must attach the GP-E2 via the USB cable and some functions don't work, whereas with the 1D X and 5DIII (and more recent bodies), you can get full functionality and it's via the hotshoe alone.
This is the footnote from the Canon site:
†When the EOS 7D is used with the GP-E2 the following restrictions will apply: a) geotagging function will not work for movies while recording; b) geotagging features will not work for movies when using the Map Utility; c) electronic compass information and automatic time setting is not available; d) transmission via the hot shoe is not possible.