FTC provision in Canada-U.S. Treaty beats the s. 20(11) deduction for U.S. dividend income of U.S. citizens in Canada

The tax rate for U.S. citizens on certain dividends and capital gains increased from 15% to 20% in 2013.  Would a U.S. citizen who was resident in Canada receive only a deduction from Canadian income under s. 20(11) for the additional 5% tax?

CRA indicated that Art, XXIV, para. 5 of the Treaty, is "a complete code in respect of the deductions and credits available to U.S. citizens resident in Canada for the purposes of eliminating double taxation on dividends, interest, and royalties," and that this generally produces a more favourable result than under s. 20(11) (because the deduction is not reduced by any U.S. foreign credit for Canadian taxes allowed in computing the U.S. tax on such item, i.e., it is based on the taxpayer's gross rather than net U.S. tax liability).

Neal Armstrong.  Summary of 11 June 2013 STEP CRA Round Table, Q. 4, 2013-0480301C6 "Foreign Tax Credits for U.S. Citizens under Treaties - Art. 24.