As quoted from the linked post.
It looks like you’re part of one of our experiments. The logged-in mobile web experience is currently unavailable for a portion of users. To access the site you can log on via desktop, the mobile apps, or wait for the experiment to conclude.
This is separate from the API issue. This will actually BLOCK you from even viewing reddit on your phone without using the official app.
Archive.org link in case the post is removed.
A month ago. Well that should of been a red flag. Honestly, it has been a terrible experience forever with soft blocks everywhere.
It’d be fitting if admin u/CorrectScale’s response became the boilerplate response to anyone trying to use 3rd party apps post July 1st.