Earlier quoted context omitted.
To an extent they do but they've refused to implement a lot of important features in iOS safari that are needed for fully capable PWAs.
Specifically, could you list features that would be relevant to a PWA that takes your electoral division as input and returns information on who to vote for? Honestly I'm confused that if a PWA is a viable solution, why this isn't just a website?
PWA was touted in the comments as a possible alternative, but PWA on iOS is not a very viable alternative to a native app in my view.
Just because a native app could be a PWA which in turn could be a website doesn't really say much about which of these it actually should be. Most apps I use on a daily basis could technically be websites, but that misses the point of why we like using platform-native apps in the first place.
EDIT: It seems it is also a website. And that's blocked too: https://news.ycombinator.com/item?id=28562772