re: Using our current methods of exoplanet detection...
Earth's wobble from AC is over a power of ten too small to detect
Transit methods work for those 1-2% of stars whose planets orbits are in the correct plane for transit
The paper cited says that the interactions of the close binaries prevents large (Earth) planet formation in the respective HZs. The authors note that such statement is ONLY valid for those 2 stars specificly analyzed