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.
I hope so, I just hope that it actually gets some traction in the wake of all this instead of getting a modest bump and then mostly dying out again, which is what seems like the most likely direction. I have faith though