Eduardo,
Only changes to the project model itself will be reflected in updatedAt, e.g., renaming the project or adding/removing wells to it. Changes to models inside a project won’t, you would have to look at the updatedAt or any other relevant timestamp in those specific models. For example, the forecast models have runDate, and the econ-runs too.
See the API documentation for the filters that are expected to be used for pulling data incrementally:
Regards