Unfortunately yes, the article is a simplification, in part because the AI act delegates some regulation to existing other acts. So to know the full picture of AI regulation one needs to look at the combination of multiple texts.

The precise language on high risk is here [1], but some enumerations are placed in the annex, which (!!!) can be amended by the commission, if I am not completely mistaken. So this is very much a dynamic regulation.

[1] https://artificialintelligenceact.eu/article/6/