MayTheMemesGuideThee
I'm confused now.
You can only have one Aura on you from your Blessing Skills
This stat is from Divine Blessing, "on you" goes just after "Aura" means it cares whether you're an aura owner.
Your Non-Blessing Skills which Reserve Mana are Disabled while you have an Aura from a Supported Skill on you
This stat is from Eternal Blessing. And I read it as it should care whether an Aura actually affects you (you have an aura buff). At least this is how I understand it from your explanation here.
What did I get wrong?
In both cases those stats are talking about an aura being on you, which means that you are the centre of the aura.
The linked explaination is pointing out that in the different wording "50% more Effect of Auras from your Skills on you", that is not referring to an aura being on you, it is referring to the effect of that aura on you - "on you" is modifying "effect" not "aura". Just like "x% increased effect of Arcane Surge on you" modifies the effect that the buff has on you.
An aura can be on you (you are the source of the aura), and/or it can have an effect on you (the aura affects you). These are independant - auras on you may not have an affect on you, and an aura not on you may have an effect on you. Both the stats you directly quote in your post are talking about auras being on you - neither even mentions effect. The differently worded stat in the linked post is modifying the effect an aura has on you, provided that aura is from your skills - that aura does not need to be on you, it needs to have an effect on you, which that stat will then modify the magnitude of.