kk650 said:

Otherwise you seem to be suggesting that any release with colour grading different to the official release is a fanedit, which would of course make the despecialised editions fanedits as well.

Not quite - I'm suggesting that a fan-modified release with colour grading different to the original/theatrical release constitutes a fan edit, or at least fan version. Unlike Star Wars Despecialized, which is based on precise examination of original prints, a recoloured Man of Steel won't restore or 'fix' any authentic experience; it will be a personal interpretation.

The official releases are, for better or worse, what the makers intended and what was seen in theatres. Reinterpret it by all means, but such a project shouldn't be considered a restorative measure, however much some may prefer it.