Yes it’s accurate. The only criticism I’ve come across is usually trivial stuff about claims on amount of people killed etc. Although that is a usual tactic of Holocaust deniers and the like to focus on a smaller or trivial matter and not the event itself. There were also westerners in Nanjing during the massacre so we have other than Chinese sources for at least some of what happened. Today there are even Japanese sources available from men who took part in the crimes.