That cut looks a bit large. You could try a tyre boot cut from an old slick tyre to see if the casing continues to herniate with the boot inside it. Or you could try a tubeless repair kit. I've used the Hutchinson Rep'Air kit on both tubeless and tubed punctures, but the cuts I fixed were not quite that large. I think the instructions with the Hutchinson claim it can be used on punctures up to 5mm size.
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