It means your auto flowering seeds after sex is determined will began flowering using any light schedule except 12/12 light schedule, because it affects your yield. Regular seeds use 12/12 lighting schedule for flowering.
all auto flower means is it flowers on its own...no matter what light cycle...most will flower between 3-4 weeks..and they finish faster then most normal strains.most af stay smaller then normal strains also...although some do grow bigger.they are also very sensitive to ferts and to heat.the majority of them are fem seeds...so you get a fem plant almost every time....all the autos ive gotten have flowered at 2 weeks old...finished in under 2 months..and all have been fem