No, that's only because the US has constructed barriers to make it cost more and take longer, to protect conventional dirty energy. Those barriers do not need to be as large. A new reactor being built would take several years, and they don't want to wait for that. That doesn't mean it wouldn't be profitable, although again the barriers may make it unprofitable or at least a riskier investment.

Edit: also, they aren't buying this reactor. They are not in the energy business. They're buying 100% of the output of unit 1. That's all. The previous owners are still running it. It stopped temporarily in 2019 because Methane undercut it, because Methane does not have to pay for its pollution like nuclear does.