Looks like that post was last edited August 30th. On Sept 1st they posted saying they think they found a way forward [1].

[1]: https://grapheneos.social/@GrapheneOS/117194007157499435

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pavon 4 hours ago | parent [-]

The discussion in the post is on-going. Two days ago they posted that they will not support Pixel 11 unless Google adds MTE support in a future update. That may happen in an upcoming December update, but it is just a rumor.

[1] https://discuss.grapheneos.org/d/41564-pixel-11-doesnt-yet-m...

	▲	arusahni 3 hours ago \| parent [-]
		Ah - that would have been a more helpful post for the OP to have linked.