It's a combined history of the various beta patches that went into 1.1. Anti-strikecraft frigates' base DPS was reduced by 25% compared to 1.05 as it states. The 43% reduction was the previous one that was found to neuter the ships.
AntiVeryLight attack type's damage modifier vs CapitalShip, Medium, Heavy and VeryHeavy armor increased from 25% to 50%
Keep in mind that was also changed to help compensate.