Thought of a couple of other techniques:
Use a hammer and flat blade screwdriver to knock the nut around.
Tack on a smaller nut if you have a welder.
Cut a slot in it with a Dremel and use a flat bladed screwdriver.
I think the only way visually is to look at it under a microscope.And then you got to know what you're looking for.
Personally I think it looks like cement board.
Interesting question and I can see why you would want to get rid of it.
Sorry, I'm not sure of the answer but I think you would need a licensed cabler to work on it and Optus should be consulted.
Welcome Somnar.
Looks like you're having a spot of bother uploading the photos.
A couple of tips, keep the image under 1Mb and if using a phone or tablet, you're better off using the Tapatalk app to access this site.
I think whatever you do, you need to get the soot off or at least most of it and then plaster it. Even just wire brushing then plastering it might work.
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