That's a comical extreme exaggeration. China has a minuscule share of and influence on the US real-estate market overall, including all of its metros. They have a several hundred billion dollar position in a hundred trillion dollar total market. They've only begun to have big influence in one city - Seattle (Amazon by itself has several times the real-estate influence that China does on Seattle). Much like Vancouver's real-estate market didn't collapse once the Chinese money stopped flowing in so easily, nor would Seattle's market. Further, most of China's real-estate influence is on a small segment of the higher end part of the market, from the capital flight of wealthier Chinese.
All of that Chinese capital flight has already slowed dramatically due to capital controls. And yet, US real-estate isn't having a problem at all (quite the opposite).
Japan had a dramatically greater position in US real-estate in the late 1980s. Guess what didn't happen when Japan started pulling its capital out of US real-estate? You guessed it, US real-estate didn't collapse at all. In fact, it did just fine from 1992 to 2000. The huge problems Japan's economy had, resulted in a small twitch in the US real-estate market, which is exactly what would happen with China.
If you don't remember, Japan tanking coincided with the S&L crisis, SF and LA real estate took almost a decade to recover.