It's funny that they say people use Tor "for a variety of reasons related to privacy, security and safety". They left out "firewall circumvention", which I have to believe is the #1 reason, at least in China.
China uses fairly complex artificial intelligence to detect TOR connections. Anything that "behaves like" TOR or a VPN is quickly caught on to and blocked.
There are a few attempts designed to make TOR look more like standard web traffic, which are really interesting.
It's definitely a cat-and-mouse-style game. Some have more success than others.
"Broken" would suggest that this isn't intentional. But yes, you are correct; domestic internet is fine, but traffic in/out is slowed and interfered with nearly to the point of being unusable.