AfterEffects Text Templates - Do changes Progagate to Instances in PPro
Updating in AE does not update the template in PPro directly -like updating a direct linked AE project-composition does. 

To update Live Text Templates that are already used in Premiere: Update the composition in AE and export Composition as Text Template (.aecap) and Overwrite the previous .aecap file. It will update in Premiere after a RESTART without loosing the unique text in the instances you've already used. Note: just making the element offline and then relinking does not seem to update it. It's possible if I deleted the preview files it would work, but I haven't tried it. So far a Restart of PPro is required to update the Live Text Template.