Yeah, watching these vids's no good. Maybe those guys're a bit more positive than,e.g. YongYea but as stated above, it's all coming from kotaku and that's not something to hold on to right now. Not sayin' that the author's lying but it's one single source. All we can do is wait for the second book to show up (it shouldn't be long). If the book won't replace DLC, we wait for official statement from BW / EA, i.e. "There're no plans for SP DLC as we're focusing more on fixing the game." which is the only thing we need to hear in order to be certain and move on but certainly not irrelevant vids like this that're just repeating the same report over and over.
Hopefully, that statement's going to be positive 🙂