"Stereotactic Radiotherapy" is not a matter of dose.
Neither a matter of dose per fraction, nor a matter of total dose.
It's a matter of the technique used.
Technique involves positioning, immobilization, accountability for possible movement, planning, verification of dose and verification of correct delivery. All that is part of stereotactic radiotherapy. And SBRT is stereotactic radiotherapy, just like FSRT and SRS are in the brain.
45/1.8 is not an ablative dose (neither an ablative dose per fraction nor an ablative total dose), but >90% of the people do it in a stereotactic way (and bill for it as well) when they treat a vestibular schwannoma.
Coming back to the issue of pancreatic cancer:
People are mixing up SBRT delivered a sole local treatment in pancreatic cancer with high doses with the aim to induce durable local control and SBRT delivered in the preoperative setting, which has the goal to possibly downstage/downsize surgery and lower the risk of local recurrence after resection. These are two different scenarios.