I think in that case he's just talking about being able to buy standard fuel bundles commercially from several sources, rather than having special ones made for a particular reactor. The latter would I imagine be more expensive.The fuel "rods" * are not reusable anyway, so there's not any need for them to be interchangeable.
* Fuel is arranged in "bundles" of thin "plates", not "rods".
I'm not in the nuclear fuel business, but I understand that the fuel rod cladding material, formulating the fuel, and packing the fuel into them is a more complex task than it may appear to be at first sight. If the fuel isn't made right it can cause rather expensive problems with your reactor.