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. The are actually going to BLOCK you from even viewing reddit on your phone without using the official app.
Archive.org link in case the post is removed.
I thought I’d be making a long-tail exit as well, but I’ve been looking at my feed of mostly niche subs with an especially critical eye this week and concluded that even there, the signal-to-noise ratio had hit the point the web did as a whole that initially drove me to Reddit.
I’ll still use it to declutter Google results, but I expect that utility to decline as helpful, detailed posts become fewer and fewer. There’s still some distance to Facebook-level network lockdown.