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Your robot text should play no part in this. You should leave the robots.txt however it should normally be for the website. Google knows that if you're serving a different country with a different IP along with a TLD that you will not be infringing on their rules regarding duplicate content because it is natural for somebody to have one site in one country and another site in another country and have the exact same content on those sites but therefore different target audiences so they're not gonna come up in the Google search rankings and they will both be good results for each country's audience. Do not block anything with robots.txt that you do not need to block otherwise Long story short if you're using robots.txt to block anything do not worry about that you can remove that block

You're welcome

Thanks for the reply. The content on the root domain would match the original URL, so I would be good there. In theory, would redirecting to the root domain also strengthen domain authority?