How can I remove this shower arm/nipple? Can it come off?

I want to replace my shower arm to make it higher. When I removed the head and metal covering, I saw that the piece out of the wall sticks out. Most videos show that this piece is recessed in the wall. How can I remove this piece? Is it soddered on?? Or can I wd40 it and force it out? Not even sure where it’s supposed to separate. via /r/DIY

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