I am not sure (I don't have an iPhone around to test this), but it might be because there are no story sources configured in your Phone. The link I provided,
https://sras.me/reform/#/setconfig;reddit=programming,scienc...
was a config url, that included a bunch of story sources to use (subreddit and HN pages).
This config is stored in the local storage. So you don't have to use the config url next time you use the app.
You can also add subreddit and hackernews pages using the settings page. Can you please try it and let me if this is the case?
If it is not, can you please check if the log is showing any network activity (there is a log at the bottom where it shows active requests)