Noted on that very website you just linked:
After some of the more recent updates, Bitmain© has decided to lock us miners out of our own hardware. We have released instructions to restore SSH to allow us to take back our miners and modify them as we deem fit with our firmware!
Bitmain locked newer units and those are no longer able to be unlocked with the program asic.to was providing so they removed it altogether to avoid confusion. Title of this thread hasn't been changed at all afaik.
Just do the SD card flash if you want to change firmware or unlock SSH.
Yeah SD flash is the best way to do it. We are not going to release the other means of unlocking the 17 series remotely at this time.