No, I am disputing your claim: "forums are not real time, and that’s what most people these days want apparently."
Obviously, a lot of people use Discord, but I think you're mistaken about their motivations. They didn't choose it because they think forums are inferior to real-time chat. We can see that by the massive popularity of Reddit over Discord's lifetime. Rather, they chose Discord because it's what was offered (along with heavy marketing), and because it was convenient (especially for community creators).