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You are correct: Since your brother was an NRI in AY 2024-25, his UK salary income is not taxable in India. Form 67 is only relevant for Residents claiming Foreign Tax Credit (FTC).
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Impact of wrong filing: Merely uploading Form 67 (without claiming FTC in the ITR) does not create any tax liability or invalidate the return. The ITR filed correctly (without foreign income/FTC) is what matters.
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Action needed: No rectification or revised filing is required. You may keep copies of ITR and residency proof in case of future inquiry.
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If a notice ever comes: Simply explain that Form 67 was uploaded by mistake, but no FTC was claimed and no foreign income was offered in ITR.