You are against that cursed energy equals cursed spirits, I want to know the reason when the verse goes against that. Megumi himself makes an analogy between curses and cursed energy when he explains about invulverability
Here he makes an analogy between curses and cursed energy. Sorcerers destroy curses with cursed energy and not with literally another curse
It is a comparison. If Gege was only talking about curses it would make no sense for him to mention "and shamans". Both have the similarity, which is cursed energy;
as we know, cursed energy goes through people's bodies when it is in small quantity
I am not saying that a shaman's physical body can walk through walls, but his abilities with cursed energy
This is because he is no longer dependent on negative energy by being in Itadori's body. In a human body positive energy is natural, while in a curse body it is not. The human body is not pure, it varies, it can have both negativity and positivity
But Sorcerers can create a protective aura with cursed energy,
even Itadori can do this.
A good exemple is in the fight between Gojo and Toji. After Gojo reinforced his body with cursed energy Toji was unable to hurt his body with a non-cursed weapon,
who later managed to slaughter Gojo's body after bypass the Infinite and use a cursed weapon
So you agree with limited invulverability?
Basically, yes. If cursed weapons had the same effect as normal weapons against sorcerers it would be better if Toji didn't use any sorcerer weapons at all, so no one would notice his presence.
Toji couldn't hurt Gojo's body with a human weapon after he reinforced his body with cursed energy