It is still available for Android phones. I know they have been working hard on revamping Mobile Nations. It is possible that it's just being revamped as well and hasn't been approved by Apple. Hopefully one of the administrators can come along and give a definitive answer to your question. Thanks!
iMore does have a Android App. Looks like this in the App store. Sometimes these things can be hard to find. The App does have access to their blog so you can still read everything. Also, if you want to. You can click on the 'author' which is 'Mobile Nations' and that should bring up all the Apps thats made by them. Hope this helps.
It must have been removed in the last couple weeks then. It's still strange no matter how you look at it. I downloaded it on my Moto G5 Plus a few weeks ago and I can browse to it on the Google Play store from my iPhone in Safari.