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Equivocation.
Nope. Jesus didn’t use ambiguous language to conceal the truth or to avoid committing Himself, as you assert.
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'It is finished' refers to his sacrifice, not the law...
Nope. It refers to the the intended-from-the-beginning completion...fulfillment...of the Law.
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...which, according the words attributed to him, he had not come to abolish.
Completing is not abolishing. Fulfilling is not abolishing.

Every day on this side of the ground is a win.