Luko's Cobra was not the same as the modern Cobras you can purchase in-game. It was originally a Cowell and MgRath special edition built in 3120, not a Faulcon DeLacy build. It is a vintage machine which has been through many owners and many upgrades during its near 200 hundred year history which straddles the entire player 'lore time' of 3125 to 3303. You can consider it a highly customized ship. Artistic license? Yes, as you obviously can't purchase such a ship as a player, but it was already established as such in the previous book. It was based upon the description of the Cobra from the
original Elite manual.
There was another Cobra of similar ilk that appeared earlier in the story, the 'Cor Meum at Animan' which dates from a similar period.
Cheers,
Drew.