I haven't read Saito's books, or looked too deeply into degrowth as a movement. I just read this article and thought it made some good arguments against what it claims are Saito's understandings of Marx. I'm not sure I agree with everything, but I thought it was interesting enough to share.
He probably wants to see Funko Pop production expand by 2% per year so our ancestors can all own a McMansion with 30,000 of them inside.
Now this is communism!