I think the designs date to the 90’s, because they’re really similar to a lot of his work in the Japanese publication >Gas Book 11<.
The copy on the text poster is literally pulled from a (’90’s) Wikipedia entry on Animal Rights, which is why it sounds borderline awkward. I’ve gotten these for friends and clients, so obviously I love ‘em. They are part of many posters published as part of Mills’ >Humans< project. As you can see, there’s a whole bunch of animal-rights-ish themed posters.