The app was rejected by Apple because it requires an external subscription that can not be purchased through Apple. So sadly it’s gone from the app store and unless @cplaverty has some secret magic up his sleeve, it will not and can not return or get updated.
It definitely sucks, but for the time being we’ll just have to use Safari (or Tsurukame, but it will inevitably hit the same wall eventually) until WK develops their own native applications that can tie into Apple’s subscription models.