I just offered it as a suggestion for why the Mandalorians might use Nukes in a practical sense. If Turbolasers at the time weren't strong enough to flatten cities, but nukes could, then they would be the obvious choice. I believe in the latter for atmospheric turbolaser shots. One star destroyer taking out the entire surface of a planet in an hour not only makes the concept of the Base Delta Zero pointless, but it also goes against what Han says in A New Hope about how destroying Alderaan would take more than half the Imperial Starfleet and more firepower than he'd ever seen. It ain't like Star Trek where you can melt a planet down to its mantle in a couple hours of Phaser volleys.