It wasn't actually originally Sunak's idea, this one was Johnson and Priti Patel. So probably not. Or at least, that wasn't the original motivation, I would not be surprised in the slightest to hear that they're moving to exploit it. Reporting in 2022 had said that other places had either been rejected for being unsuitable or had refused to agree to the deal, so it seems like Rwanda was basically just the one place that said yes. Being far from Britain, landlocked, and poor enough relative to Britain to be cheap to persuade (you know, if your idea of value for money is burning it to be a dickhead to refugees) makes it ideal as far as the creators of this policy see it