I'm quite suspicious of that statement from the CTD. Seriously, why the heck would the NR limit itself to a SINGLE DSD per year, that's a perposterous idea, and whichever minimalist writer thought of that should never touch SW ever again.
The quote is pretty self contradicting anyawys, because CTD is supposed to be written just after BFC, and the DSD should have only been out for a year. If they already built 10, why reduce to 1 per year.
That gives the DSD a decisive advantage over the ISD-II, because it has more power available to shift to weapons or shields than the ImpStar Deuce
The Sovereigns and Eclipses probably would have eventually been in the hundreds, but their construction began too late, not to mention that their exotic weapons and large size would probably slow down their construction (Especially Eclipse, which was built exactly to Palpatine's specifications). I'm sure the design and developpment of that axial superlaser took the bulk of the time.