Nah it's a fact, you can read the summary of the whole novels on wiki. Pink undies are still mentioned in it. Just search up Naruto shinden 2018. It will bring the four up and you can read the summaries.Oh, so only parts are translated. Ok. It could also just be a joke that someone did but ok I mean what do I know.
You misunderstand when parts are translated it means parts they deem relevant. Because those the things people want to know or deem relevant.