Review Detail of Poraemon in I'm the King Of Technology

A kingdom building novel that written purely on author's imagination with little or no researching and logical thinking. MC'S 260 IQ gives me some thought that I might have over 9000 IQ myself. He knows nothing. He did loads of stupid, naive and illogical thing without consequences followed. Other characters are bad too, no dimension at all. The technologies are meh and mess up. The technologies development in another world can be different, and the differences must have logical reason to them. The land without a known natural resources is one of the biggest city in a kingdom. That city is old enough for farmers to plant crops until the soil is not fertile anymore, but secret mines are never run out. They feed millions of their citizen by growing crop without using any farming tool or fertilizer at all, how?