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Human-powered effort + 'spirit of the race'
If you have to question whether what you're doing is a bit dodgy, then it's a bit dodgy.
"From the original GDR rules:
The original intent of this race was to ride the GDMBR as fast as possible in the simplest/purest style possible. As time has gone on people have begun looking for loopholes within the rules that'll save them time on the course. This is human nature and all of us do it in different ways in our everyday lives. With respect to the GDR, we ask that you please consider the long term ramifications of finding and using loopholes--the race will only get 'easier' and (conversely) require more rules/regulations as time goes on. This goes against all of the principles that the race was founded on. People: PLEASE don't bring The Race down to your level--elevate yourself to the level of The Race. If you find yourself looking for loopholes, consider taking another year to prepare before racing. Most likely you'll go faster and enjoy it more as a result."
If a wing suit is cheating because you benefit from wind assistance, how about descending where you benefit from gravity or, indeed, aero bikes where you benefit from the lack of wind resistance?