If I can offer a suggestion. If you have android then I'd recommend you switch your browser to firefox and follow these steps (not sure if iOS has firefox, or if it does, if these steps will work on it):

1. download uBlock origin for it (yep, same add on, works in android firefox)

2. browse to reddit, an interstitial should pop up nagging you to use the app.

3. open up the menu and select uBlock origin at the bottom, select the eye dropper tool.

4. click on the div that is dimming all the content, this should give you an option to filter it out, uBlock will give you a list of parent elements you can add to the filter instead. In this case the one you are looking for is .DualPartInterstitial. You can verify with the preview button.

This will commit this div to your personal filter list.

If you frequent sites with these types of nags, this process will let you manually dismiss them until they redesign. Ideally they would respect your preferences themselves, but they never do.