Yes, I am.
You are not. Don't worry.
You are right: Nothing in RQG tells it. My memory was from a previous version. RQ3 Magic book p55: "an enchantment can not be dispelled, dismissed or neutralized". So, for RQG, you are right.
You are right, the whole paragraph has been omitted.
Ritual, for me, are not 'by definition, impossible to dispel.
As I haven't played RQ2 since 85, I don't remember, but I believe you (my copy is 150 klick away and I can't check, but even if I could, I would not: I believe you).
RQG p250, usually, enchant requires the loss of POW.
As I'm waiting for the physical copy, I have not checked the pdf availability. My mistake.