Hey man, not trying to sway anybody, just urge caution. You can reach your own conclusions and that's fine. But just so you know, I read the paper, and then read a bunch of other papers criticizing their methods, and then ran the numbers myself to test their hypotheses. You can try it yourself if you have Excel and a few hours.
The short version: DIX has the same predictive value as a random number generator on ALL timelines. GEX has the same predictive value as a random number generator on the immediate timeline, but 30-day moving average and above is a somewhat decent inverse predictor of SPY movements 30-45 days out. Please let me know if you find any reliable methods to reach any different conclusions.