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.

https://web.archive.org/web/20230611224026/https://old.reddit.com/r/help/comments/135tly1/helpdid_reddit_just_destroy_mobile_browser_access/jim40zg/

    • It will still be a useful repository of knowledge. It’s going to be a hard transition, most of the time when I google something I need to append site:reddit.com, to get a useful answer

        • Absolutely. The value from the knowledge that I’ve gained from reddit is intangible. It will be next to impossible for me to not use it as reference material in the future. I mean we’re talking about close to 2 decades of crowdsourced information.

          Being able to filter out bad information with downvotes was also amazing, and part of the reason I will most likely be moving away from beehaw communities (no downvotes, wtf?? trying to be youtube, eh? 🤣 )