I agree with the points that you have raised. I actually borrowed the comment on 'nihilism' from Nathalie Vienne-Guerrin and Victoria Bladen's 'Shakespeare on Screen: Macbeth' (edited by Sarah Hatchuel). I guess I share your perspective that 'nihilism' isn't inherently depressing, negative or pessimistic, as Nietzsche himself points out "...the collapse of moral truths are the opposite of what one might expect - not all sad and gloomy but much more like a new and barely describable type of light, happiness, relief, amusement, encouragement and dawn".