Review Detail of ComRom in My German Empire (Translated Version)

I can’t read this novel due to the inaccuracies with the timeline. This story is supposed to take place around 10 years after the WW1 yet at that point Germany had no monarchy anymore as the monarch was exiled and Germany switched to a full on democracy. This is not historical in basically any sense (except for the characters). And of the author did even 2 seconds of research they would have easily noticed their problem and then maybe set the novel before WW1 so that it all actually makes sense. BTW it’s impossible for the mc to have brought this change to timeline as according to the mc he is still uncomfortable as the prince implying that he only recently took over that body.