If you read further, at first they mostly talk about stacking, even though it has nothing to do with "AI", but then they suddenly mix it with synthetic ML techn

If you read further, at first they mostly talk about stacking, even though it has nothing to do with "AI", but then they suddenly mix it with synthetic ML techniques, which defeats the point. Confusing. Nevertheless, you can do some proper astrophoto with smartphones without any AI, just like you would with any other camera. It won't be that good for obvious reasons, but it's possible and it will be better than using automated astrophoto modes in any app. Calibrate your lens and sensor, make a RAW stack with fixed exposure which is not too long, and some dark frames; use something like Sequator (or more sophisticated software) to process the stack.