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 is it with almost every modern website constantly refreshing until it errors out on my phone? I always just assumed it was because I blocked trackers and they just gave up trying to display their cancerous page.
Why make the mobile experience good when every single website wants you to download an app?