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IIRC Kronii mentioned rolling Jack during the short time she mentioned trying out FGO so that probably would have been back around when London or America dropped.
The timing for this shill stream does line up though because NA has the Start Dash GSSR right now where you can get a Limited Year 1 5* for only 12 paid quartz on top of the Ilya/Miyu banner, so it would be mildly humorous if they rolled on stream and got either Nero Bride or Tamamo Summer.