I've watched a lot of Wolff, but I haven't read his books. His preferred definition seems to be that socialism is when workers run their own workplaces. This is something I am of course in favor of, but he also acknowledges that Stalin and Bernie Sanders get their own claim to the term, with it variably meaning when the government runs the economy or when the government provides social programs. There's also Martin Luther King Jr.'s famous phrase "socialism for the rich and rugged individualism for the poor" which appeals to a lot of people but more or less buys into the definition I talked about here. So, I feel like it's not nearly a resolved question, and if you look at socialism as it's been put into practice, it tends to follow the latter definitions rather than the former.