I doubt the spout pipe is soldered in, should be threadedr. When cranking on pipes like that generally two pipe wrenches work best but if you can only have your hand on one side vice grips might work. You can try clamping it to a stud somehow lol. If it’s soldered though I’d think you’d need to cut it or heat the solder up with a torch to remove it but I’m betting it’s threaded. Don’t be surprised if it’s tough to turn. You might be able to loosen it up with a torch, be careful not to burn any wood. If you do have to cut it a pipe cutter or hacksaw will work if you have room. A reciprocating saw is an option.

I should mention I’m not a plumber though minor plumbing is part of my job plus I’ve owned two houses over a hundred years old. It’s hard to give specific advice remotely. You’ll figure it out. Adapt and overcome!