> similar to asking Siri to ask chatGPT to ask XYZ

Effectively, it sort of does that, but really it just listens to the wakeword and opens/switches to the requested app & modality.

FWIW, I get a very different functional result using the Shortcut method vs. asking Siri to delegate natively. To compare, I asked Siri (non-beta here) now to "ask ChatGPT <x>" and I got a top-card with some fairly low quality SEO-ranked weblinks.