I did read it, and just read it again. I don't see where "it clearly states it goes beyond party members", but maybe I missed it, so a quotation is welcome. The relevant descriptions include "Tens of millions of Chinese workers, students and civil servants...", "Many employers now require workers to submit daily screenshots..." but those don't really allude to party-affiliation or lack thereof (as far as I know college students are allowed to join the party, and I suppose certain workplaces like government offices might consist entirely of party members).

The article does say there are >100M users of the app, and according to Wikipedia, CCP has ~100M members, so the numbers appear in line.

More detailed anecdata: the aforementioned acquaintance who use the app is employed at a Chinese university, and according to him they do have an institution-wide rank (among employees; students not included); party members are ranked, but non-party members are not (because they're not required to "study", as I already pointed out). He even told me he's ranked at around 30% at the moment, lol.