The article mentions, oddly enough at literally the very bottom, that one of the main laws being used is the 'Wolf Amendment' [1], passed in 2011. It's what prevented Chinese from working on the ISS and arguably is why China now has its own space station. It's an extremely dumb law that's been passed and reauthorized repeatedly by every single administration and Congress since Obama who it was passed under.
Just quoting Wiki since it's quite succinct and accurate on this: "[The Wolf Amendment] prohibits the National Aeronautics and Space Administration (NASA) from using government funds to engage in direct, bilateral cooperation with the Chinese government and China-affiliated organizations from its activities without explicit authorization from the Federal Bureau of Investigation and Congress."
For another consequence of this law, when China relatively recently carried out a sample return from the Moon, they sought to share the resultant rocks/material with countries worldwide, much like NASA did in the 60s. Except Americans couldn't accept them, at least not without jumping through a million hoops first, due to this law. It's one of the ever more frequent 'I'm going to punch myself in the face because I don't like you' acts by governments.