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I asked this question on the US forum. They asked me to post here. https://ttlc.intuit.com/community/taxes/discussion/re-i-had-a-question-about-the-way-deemed-aquisition-works-for-capital-gains/01/3351419#M1234725
Yes, if you are a resident of Canada, you would need to report the sale of the shares on your Canadian income tax return.
But, we only deal with Canadian taxes here, so we can't tell you if you need to pay any taxes to the US or what amounts. Perhaps contact the IRS?