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.
Yikes this is so insane. I’m so sick of the ads and spyware laden apps. Once you look into that abyss it’s hard to unsee it. It’s uncomfortable to have every aspect of you monetized and viewed. It’s unnatural man. I just started hardening my internet and device use this year.