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I think that you're thinking back to 2006 when the ACO made AC or something like it mandatory and everyone had to ballast up their cars by 25kg across all classes.
The ACO lowered LMP1 minimum weight from 925-900kg in 2008, before bumping it up to 930 before LM in '09, mostly in reality to help with overweight Peugeot.
In 2011, the ACO bumped minimum weight of LMP2 up to 900kg as part of their cost cap regs. The weight increase to 930 doesn't have anything to do with AC, which has been mandated in some form for several years now (be it actual AC or cockpit ventilation). Probably has more to do with cost caps and the bump up to 600bhp from 450 with the last generation cars, as well as making LMP2 tubs DPI compatible.
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