Originally posted by Lord Stark
True, but the Immobilizer 418 is 600 meters long and could be called a Star Destroyer I guess.
http://starwars.wikia.com/wiki/Immobilizer_418_cruiser
Under the class system, it wouldn't be classed as a Star Destroyer, it's a heavy cruiser according to the Anaxes War College System. Though the Interdictor-class Star Destroyer built by Kuat is indeed a Star Destroyer.
As far as the quote goes in the OP, if it's going off that system, then the only cruiser of the Kotor era at the time that would be classed as a Star Destroyer as far as size goes, would be the Centurion class.
A Star Destroyer size is from 1,000 to 2,000 meters.
A Centurion is sitting at 1,200 meters.
Now that quote doesn't specify any one Destroyer, there are multiple Destroyers in both size and weaponry.
So yes, the Centurion class does rival a Star Destroyer, that said however it doesn't do both. On one hand, it does outsize certain Destroyers but has fewer weapons. Even moreso it's outsized and outgunned from the majority of Destroyers seen.
So therefore, that quote isn't saying it rivals any one type of Destroyer, instead it's just in that class range and has firepower of a Destroyer.
That's the most logical sense I can make out of it.
@Merchant, k.