Well he's thinking about it, he hasn't actually retired.
I might be wrong, but I doubt he'd be tweeting that if the royalties were good. That's not an attack on his character, either. It's common sense, you don't climb out of a gold mine.
It's wise of him to close the door on a pro board. It's probably psychologically stressful to have undergone his injury in his prime and to still have a board despite not skating. He could even develop imposter syndrome after awhile; he might not think he's accomplished enough rest on his laurels, and feel like a pro model is mocking him at times and that he's become a fraud.