I assume Tiny got the list from some KFP autists that keep track of that shit, or at least I hope so. The list is pretty disingenuous, considering for a lot of those people it was more like "you should come to Austria to visit" "yeah maybe one day" than anything else. Mumei was really the only one I remember that was supposed to actually happen, and like you said, she got sick. Even Kiara said it was a maybe for Ame, at best.
Frankly, a lot of it is Kiara opening her mouth way too soon. The EN girls are one thing, but the JP girls are generally busier, and they especially were busier than EN in 2022.