This argument doesn’t hold. There are several countries such as Finland that have operated nuclear power plants for decades and do not have ambitions for nuclear bombs.
If you want to go with that argument: cite Japan, not Finland. But it doesn't have to be 100% true to be largely true. The overwhelming majority of nuclear capacity has been built out by nuclear powers or aspiring nuclear powers. And with few exceptions the end of their warhead buildout happens to correlate with the end of their megawatt buildout.
Japan has a stockpile of separated reactor grade plutonium sufficient to make thousands of bombs. This is a deniable kind of proliferation. If push came to shove they could weaponize that material without having to make new plutonium.
(And, yes, reactor grade Pu CAN be used in weapons, with proper design.)
