There are different versions out there so I don't know if my statement is globally accurate but I would not call it auto-tuning. But for me the tuning process is magical compared to mech gearing.
TLDR: You shift to the 5th ring, put it in adjustment mode, now each click is a microadjustment something like 1/10 or 1/12. You adjust until the chain begins to rub, then back it out I think 5 clicks and you are done. That single adjustment means you can shift across all gears.
https://www.youtube.com/watch?v=nBIXq82M_oU
TLDR: You shift to the 5th ring, put it in adjustment mode, now each click is a microadjustment something like 1/10 or 1/12. You adjust until the chain begins to rub, then back it out I think 5 clicks and you are done. That single adjustment means you can shift across all gears.