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.
What awful timing to run this experiment.
Good news is best delivered piece by piece, bad news all at once.
The outrage against Reddit is already at its peak, may as well use it as cover to do more anti-user stuff.
The post is over a month old, more like good timing to bring this to people’s attention now haha.