Once Essayli and Co. have determined that someone has committed a felony by re-entering the country, the whole game changes:

As soon as the task force ID's an alien booked into a local jail who has a previous deportation, they seek a federal criminal warrant on them for felony re-entry, signed off on by a federal judge.

Unlike an administrative ICE warrant or ICE detainer request, these criminal judicial warrants for 8 USC 1326 CANNOT be ignored by sanctuary jurisdictions, and California's sanctuary state law cannot shield aliens from these criminal warrants. Instead of releasing the alien inmates and ignoring ICE detainers, jails must hand the aliens over to the Feds, regardless of sanctuary policy.