As a complete noob that started with a demon, there is no need to state you need RGH2 as you don't. You need rgh2 if you have split cb, which would be a result of updating the dash to 14717/14719. That is independent of anything demon related.
You can keep it RGH1 and have a glitched nand and a fusion.
The demon CAN let you load retail and a glitched, you just didn't see the connection of if 14717 or higher, then RGH2.
As my friend with a Falcon right now is debating to update to split to stay retail/glitched, Or go glitched with a demon. A bit of a waste, but his choice. He has another system for LIVE use.