This is what I found:
The take here is that the SATA group has decided to repurpose the SATA power connector and has retired Pin 1 and Pin 2, meaning that those pins are no longer used to provide the 3.3V rail to the SSD/HDD. In the same manner, they have also repurposed Pin 3 to be used by entreprise drives as an enable/disable signaling pin (search on this forum issues reported by users chucking HDD from enclosure complaining the drive wasn’t powering up and found that they had to isolate Pin 3 with tape.)
