Some clarification on this issue was given in an interview with Carl Macek by Chris Meadows on the Space Station Liberty program on 4/14/07.
After the relative success of Voltron: The Third Dimension and Roughnecks: Starship Troopers Chronicles, a new Robotech sequel was proposed that would use 3D CG visuals, with producer Jason Netter and writer Carl Macek at the helm.
Contrary to what their name seems to imply, the "'Robotech Defenders'" are not part of the Robotech Anime Universe adapted by Carl Macek and released by Harmony Gold USA, however they did adopt the same moniker and logo.
Carl Sagan | Carl Jung | Carl Orff | Carl Maria von Weber | Carl Lewis | Carl Zeiss AG | Carl Linnaeus | Carl Sandburg | Carl XVI Gustaf of Sweden | Carl Levin | Carl Zeiss | Carl Michael Bellman | Carl Friedrich Gauss | Carl Froch | Carl Perkins | Carl von Clausewitz | Carl Reiner | Carl Hancock Rux | Carl Gustaf Emil Mannerheim | Carl Edwards | Carl Cox | Carl Bildt | Carl Barks | Carl Wilson | Carl Schmitt | Carl Milles | Carl Crawford | Carl Bernstein | Carl Andre | Carl Van Vechten |
Directed by Bill Kroyer (who also co-wrote with Carl Macek) it featured his signature style of integrating wireframe CGI with traditional hand-drawn animation.