Yes, but those were subreddits that popped up and were dedicated to sharing those pictures. I doubt any genuine community was affected.
Oh I don't know any real details about it, or what "community" was affected, that's just what came to mind when they mentioned DMCA take-downs in the post. I don't think there was a ton of other content that got enough attention to warrant takedown notices
I imagine a lot of them were for image thumbnails since reddit actually hosts those.
And then the CEO wrote a hypocritical blog post about it. Pretty rich.