Download DS "DLCs"... Is still possible?

Hello everyone. In these days I was playing a bit some old DS games with my R4 and I noticed that a few of them have an option dedicated to "downloadable content" (why these contents have to be unlocked with a download Nintendo, why?). Unfortunately since 2014 Nintendo stopped WFC and now it's impossible to "download" these "DLCs" normally and it's a shame because in some games the downloadable content is essential for 100% completion.
So I herad about WFC Patcher and i tried it following a...

Download DS "DLCs"... Is still possible?