you are looking at it in too simple of a way. Maximizing prodcutivity must consider time invested, too. It is a rate, not a counting statistic to properly assess such a question.
1300grams sounds great, but if it takes proportionally more time to do so, it's not so great as it sounds. I don't care if it is real or not, lol. You can't defy natural laws that definie upper and lower limits of growth rates. Growth rate ranges are not drastically different in autos or photos. The only thing that is different is how they trigger flower phase. In the simplest terms, productivity should not be much different, but consistency of autoflowers sucks ass in reality.
Due to greater consistency of clones, which you cannot utilize with autoflowers, you can definitely outproduce any autoflower garden... absolutely wipe the floor with it, LOL. Simply clone a fast growing plant with a short flowering period that produces dense donky dick buds... no room full of genetically variable autoflowers would ever keep up... never.