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I'm quite sure it's the hydraulic di2 version..
And as far as I know:
9100 mechanical + mechanical
9120 mechanical + hydraulic
9150 di2 + mechanical
9170 di2 + hydraulic
(source https://cyclingtips.com/news/shimano-dura-ace-di2-9150-groupset-specs-weight-price)
Jaap
Dick
*9150