I very much disagree with this definition of optimism. Optimism is a belief that things will get better because most people will actually work for that. Basically, it’s faith (not necessarily in a higher power), which is oddly missing from the happiness, optimism, hope trilogy here.
In fact, I think he entirely swaps the definition of hope and optimism. I am not at all optimistic (in that I don’t believe people will rise up, or that the people with power will make things truly better) but I have hope (unfounded, not driven by people action) that I am wrong.