Why did Marco Polo say the Buddhist religion originated in Sielan?

Read page 295 here . Also refer to the editorial note on p.289 “*this is the well known island of Ceylon, both direction and distance are extremely correct*”. **A Summary.** Until 1890 the world knew Buddha was from Sri Lanka. In addition to Marco Polo, Pre-1890 historical references from Robert Knox, a Bible commentary and Sir, Henry Charles are provided. More here -> https://jambudipa.quora.com How the history was allegedly distorted is mentioned here . Does this sound credible?