While it's ridiculously difficult to find information on this city sim, there are a few things for certain. This city simulator has been recently developed in China and focuses mostly on transit infrastructure and "creative transit networks/layouts" (which by the way, handle UDI) to quote a source regarding this mysterious game. The game does have a title, simply going by "A9" or "A Train 9"(although the game is not based around trains, you still build cities), which does not make finding information on it any easier. So on that note, if anyone knows anything else about this game, comment here!
Meanwhile though, you can view these other few vids: