MS is a state backed company. Very natural that China went the same path.
Besides, the statement's completely nonsensical - there were multiple OSes developed by for-profit corporations in the West (Microsoft, Apple, Nintendo, QNX, Be, etc.).
It's kind of an extraordinary statement that an OS couldn't be developed by a for-profit organization, especially if the hardware's somewhat fixed and you don't need to support every piece of equipment under the sun.
It makes absolutely zero financial sense to create a new general purpose operating system.
That's billions of lines of code. With a B. And that's just the code - getting it to work with hardware?
Do YOU want to talk to 10,000 hardware vendors and get them on board? No! Nobody does! That's just money burning!
But, there are valid political reasons for creating a new general purpose OS.
If you are building for a single abstraction, code gets much simpler, instead of building a platform that multiple abstractions can then be built on top of.
