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Yeah, surely? I mean there's that dude on a Kona Sutra which weighs a ton - I know because I've got one.
Skinny has been riding very well but he's also not suffered mechanicals or got lost (AFAIK) which seems to be where a lot of people lose big chunks of time - days even. As someone who has never done anything even remotely similar to this... I would want to prioritise reliability over nearly anything else. Weight would be one of the last things on my mind - I'd just compensate with ultra low gears and spin up hills at 100 RPM.
Having said that as mentioned above they're not very servicable so perhaps not the best choice
The difference between the lightest and heaviest kit lists on TCR will be many multiples of the 'extra' weight of a Rohloff compared to a normal geared drivetrain.