clarify about the 24hours rule

So I'm leaving soon to South korea and have two stops in China whithin 24hours.
Today someone told me that the regulations changed since February. And only one stop is available.
He send me this as proof: Can someone confirm (that traveled after this time) that it's not true and two stops whitin 24hours, you can go to your third country with no problems. He also said that some airports in PRC might not have specified transit area for TWOV (some that does have seems to be Beijing, Shanghai and Guangzhou airports). In that case you will not be able to pass through and catch the flight to the third country.