lol, as if amphibious assault against a country that has been preparing invasion for 70 years, as well as a country that is at the forefront of electronics, is that easy.
yes, China is building tons of ships. but each ship, which cost a few hundred million each, can be sunk by Taiwan's advanced missile systems, for a few million per missile. Each ship needs to be fueled properly, which is also extremely hard logistical task, just ask Russia. And these ships move slowly across a region that is heavily monitored, making them easily sank. And once enough ships sink near the landing area, it would be even harder for other ships to make it to the landing beaches.