Thank you for the detailed answer Samuel. I managed to fix it with this. It seems that simply removing the kernel spec from ~/Library/Jupyter/kernels/ also works, and starting Sage does not re-add it. I do not recall how it got added in the first place. Something strange about the ~/Library/Jupyter/kernels/sagemath directory on my machine was that it was 1.6 GB in size and appeared to contain the full Sage documentation.
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