ETA: They didn't ship data off to e.g. ChatGPT. They hired a subcontractor to build them a secure AI service.
Details in this comment:
https://news.ycombinator.com/item?id=47035141
leading to this:
https://endaleahy.substack.com/p/what-the-minister-said
The government is behaving disgracefully.
They don't have a budget for that. And besides, it might be an externalized service, because self hosting is so 90s.