Review Detail of Farue in Blacksmith: You Are Making Mjolnir For The Forging Exam?

Wtf happened after around the 400 chapter mark. It's like the novel completely turned on its head from the mc producing mass producible products for the military to saying he suddenly needs to value his own combat strength despite being weaker than a common grunt and use supernatural energy only and science is completely inferior. Also suddenly the names of countries change from nine provinces ect, to just China. Then mc produces a youth enhancer for "only chinese people" and that"Caucasian people would have inferior effects". Literally wtf it was fine if the racism was even slightly concealed behind divine dragon country or something but to literally just say China and FK white people makes me question if the author had a stroke between chapters.