Not sure what you mean there? The divers who created DIR have consistently opposed deep air since at least the early 1990s. That happened before GUE was founded in 1998. It's all in the old Aquanaut Techdiver mailing list archives if you want to look.It is GUE -- not DIR -- that says air below 100 ft is a no-no.
The term "Doing It Right" wasn't trademarked or comprehensively defined at the time, which led to some misunderstandings about what it really meant. Let's not perpetuate old misinformation.
It is sad and disappointing to see some irresponsible training agencies and instructors still teaching deep air. There is no valid reason to do that. Nothing in civilian sport diving is worth taking that level of risk. Yes, I am aware that helium is expensive and sometimes hard to obtain. So what. If you can't afford the gas then get a rebreather, or just dive shallow. There's a lot to see above 100 ft / 30 m.