Thank you for researching what it means. I can tell you, none of that made sense to me.
This is what He revealed concerning the arm of the idol shepherd in a way I could understand. His "power" is clean dried up. The arm (weapon) is dried up of power.
Romans 8:28
[28] And we know that all things work together for good to them that love God, to them who are the called according to his purpose.
Evil has no more power when all works(by God) are for our good. Then what is evil? Evil has been cast out. Is not all good by God for us?
Romans 8:31
[31] What shall we then say to these things? If God be for us, who can be against us?
I see the deceivers arm clean dried up of power over those that walk in the light. No weapon formed can prosper against us.
Job 12:14-16 speaks of God:
[14] Behold, he breaketh down, and it cannot be built again: he shutteth up a man, and there can be no opening. [15] Behold, he withholdeth the waters, and they dry up: also he sendeth them out, and they overturn the earth. [16] With him is strength and wisdom:
the deceived and the deceiver are his.
Isaiah 14:16-17
[16] They that see thee shall narrowly look upon thee, and consider thee, saying, Is this the man that made the earth to tremble, that did shake kingdoms; [17] That made the world as a wilderness, and destroyed the cities thereof;
that opened not the house of his prisoners?