I think it is meant to parse as "[the hidden urls in] (photos, videos, GIFs, polls, and Quote Tweets) no longer count towards your limit", not "photos, videos,

I think it is meant to parse as "[the hidden urls in] (photos, videos, GIFs, polls, and Quote Tweets) no longer count towards your limit", not "photos, videos, GIFs, polls, and (Quote Tweets no longer count towards your limit)", because those first 4 things have existed for a long time on twitter. The original title was only wrong because it is only a limited set of URLs that don't count, but the title implied all do not.