It worked fine until June or July 2023. Now it doesn't anymore, probably because Medium stopped allowing the first three articles readable for free.
Now there's no more free views, so even when Nodium deletes cookies and you look like a new visitor, every article behind the paywall is "cut" (i.e. you can only read the first part).
I thank Nodium developer for his efforts, but I'm afraid he cannot fix this change.