Problem is that those combing artifacts are present in the fields itself, so ivtc and deinterlacing will not remove them.
Also those artifacts have do not have a thickness of 1 pixel and thus will not be detected as normal combing artifacts.
Look at the output of the Vapoursynth script without any deinterlacing&co and you'll see for yourself. (alternatively, separate the fields and look at the fields)
-> normal automated field matching will not remove those artifacts
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