This script uses the old dump_graph_json api to copy production data to a dev_appserver local instance to allow developers to test frontend changes with real data. It's been broken for a long time.
https://github.com/catapult-project/catapult/issues/3024
When we want to test frontend changes with real data, we deploy a dev instance but don't direct any traffic to it. V2spa actually ignores the API entirely when running on localhost and generates random data in the browser. If devs really want to populate datastores in local dev_appserver instances, they can post Histograms to /add_histograms, either fake or fetched from /api/timeseries2.

Let's remove load_from_prod and keep deploying dev instances to test frontend changes.