[OpenCore] Disabling NVIDIA GPU via Spoof-SSDT.dsl - help?

Hey guys,

So I wanna disable my Super 2070 RTX in my desktop prior to installing my RX580 and found this guide (paragraph 1.3): https://dortania.github.io/OpenCore-Desktop-Guide/extras/spoof.html

Please bear with me as I don't fully get the concept yet, I've never worked with MaciASL before. I've downloaded the app and opened Spoof-SSDT.dsl from the above link. I am presented with code upon code, as you might expect. I then proceeded looking up _SB.PCI0.PEG0.PEGP (found it twice) and replaced it with _SB.PCI0.PEG1.PEGP (my own GPU PCI path, looked up under Device Manager in Windows). Upon using Save as -> ACPI Machine Language Binary, I get a an error that it can't be saved.

I am probably not fully grasping the concept of these files and compiling yet, but could you guys help me out here?

1) Can I even use the file "Spoof-SSDT.dsl"?
2) How do I compile the file?
3) Do I place the compiled file under /ACPI ?

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Thanks for your time!