I ran into this issue last week but it's gone back to letting me access the site normally on a mobile browser. This may have been an A/B test measuring app conversions pre and post mobile browser blocking.
Same for me, I used it as a welcome opportunity to get rid of the Reddit habit, which was surprisingly easy. I haven't gotten much useful content out of it for quite some time.
For anyone using Android OS phones and tablets, the open-source Fulguris web browser has a setting to always report as a desktop web browser, which avoids such shenanigans and all-around gets better working and more usable and useful web pages.