At any rate, it means that besides TODOs, all we have to change in the BIP is specify that "The behavior of OP_CHECKSIG and related opcodes is changed when verifying proofs to hash the commitment to the message" or words to that effect (apologies if I missed something in this correction).
Note that we have a total different scenario here with what Greg Maxwell has proposed:
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As far as I know, gmaxwell did not help with the BIP322 design, so why do you keep bringing him up here?