You mean to the coaxial on the soundbar? Yeah, all you need is that type of cable.
Optical to optical, or coaxial to coaxial. Since you have both inputs on the soundbar, you just need to determine which digital output is on the TV.(Opitcal should be labeled either optical or TOSlink, and the output should have a little flap on it. If instead it's an orange or black round output, it's coaxial.)
Don't believe everything on the Interwebz! A duck's quack DOES echo!