Is Wang Mang a traveler in the Western Han Dynasty?

No, there is no proof of crossing from beginning to end. There are archaeological discoveries and modern objects in the site, but they have never been recognized. According to Einstein's special relativity and general relativity, things that travel through the past no longer exist. There is also a saying that it is possible to travel at the speed of light, but it is not available at present, just as a perpetual motion machine (not a real perpetual motion machine) needs other substances, such as a magnetic monopole (a magnet has two stages). So it's not crossing.