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Thank You for such a nice and descriptive answer, you're 100% right and I did not received any manual penalty from Google. I even tried to add up new content but it does not made any difference so I thought to transfer all the content to new domain. By the way you've got semrush premium account? and how much useful is that?

Using your keyword twice is definitely not what I would call keyword stuffing. But I would make sure that you create quality content for this post as the EMD (exact matching domain) could get  you in trouble someday if you don't do this.