I didn’t do anything to my blueberry auto other than a good feed once a week and some water when required. The reason they say not to top or do anything drastic to an auto flowering cannabis plant is because as soon as you see a tiny seedling the clock begins. So you really shouldn’t give your plant too much stress as it won’t have enough time to recover and it will start flowering when it is much smaller than it should be. Mind you I have also read some success stories with auto flowering plants and different training methods.
Also it was outdoors, which makes a huge difference
Topping only agrees with certain autoflower strains apparently this one is one that doesn’t