Muhammad didn't "explain" this proactively. In Sahih Muslim 2135, the Christians of Najran caught the historical error and humiliated Mughira bin Shu'ba! Your Prophet only gave an excuse because the Christians publicly exposed the Quran's chronological blunder.
🤣🤣🤣🤣You rejected Jesus’s mustard seed idiom as a "factual error," but now you are begging me to accept "Sister of Aaron" as a "Semitic idiom" to save the Quran from a 1,400-year historical blunder. Play hyper-literal games, win hyper-literal prizes. 🤡🤡🤡🤡