The auto-flowering plants are, to my knowledge, are from the Ruderalis species of cannabis. They have less THC than Indicas or Sativas, yet are short, and auto-flower due to the unchanging light cycles.
The earlier examples - yeah. The more recent hybrids have addressed this issue, the following strains all have medium to high levels of thc - lowlife auto ak47, lowlife automatic hindu kush, lowlife automatic blueberry, lowryder diesel ryder, lowryder easy ryder, lowlife automatic lemon skunk, big buddha seeds automatic, short stuff seeds blue himalaya, advanced seeds top69 - and there are many many more, with new strains appearing all the time.
This thread is so full of half truths and misinformation.