I'm not a Connect dev and the app is not open source yet, so I can't quantitatively give you an answer. As a user, it's been working fine for me on all feeds.
I recommend posting something in the Connect for Lemmy community. If a feature is broken, the dev probably wants to hear about it.
I would love for this to be a feature, I want to filter out any posts that could be a trigger like sexual assault. I could do it in the reddit third party apps.
You can block communities and magazines that focus on it, which should get rid of the lion's share of Reddit-related content. It's been a bit disappointing to see so much low-effort, choir-preaching memes and content flood in. Hopefully the Fediverse can progress to a place where the primary activities extend beyond discussing the Fediverse & Reddit.