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So BattleScribe shows the points for the marauder destroyer to be 309 points and an extra 240 points if you want the 8 hellstrike missiles. Looking at forums here and elsewhere it seems everyone takes this number at face value. However the actual Imperial Armor index and chapter approved 2018 (I only have screenshots of Astra Militarum points from the internet so this may be incomplete) show the base cost to actually be 286 points and an extra 96 for the hellstrikes. The most recent FAQ doesn’t address the marauder points. Is everyone else being misled by BattleScribe or am I the idiot here and missing something?

Battlescribe is correct. Look at the index what weapons the unit has and recalculate the points, the twin AC, and the hellstrike missiles, have been updated in CA2018. Everything else is unchanged.