Some curious responses in here - the man is nearly 70, I don't think he's looking for exposure. And Heaven 17 (previously founding members of Human League) were amongst the synth pop pioneers at the start of the 80's, and he has his place in the foundations of the genre.
That aside, his tweet is a little curt, and has probably closed off any chance of negotiation. Musicians are understandably tetchy when it comes to the industry and their music - with streaming paying a relative pittance, and many bands living on merch sales (labels now take a huge slice of touring revenue), I have some sympathies with his position. On the flip side, he's lucky to have been a musician at a time when physical media was a great source of income, and modern acts will struggle to make the kind of monies he did.
A sorry episode all round. On the flip side, Synth Brittania is a great wee documentary about the burgeoning synth-pop scene in the industrial towns in the UK;