I find that concerning, as it appears that despite efforts to curb Chinese New Year travel and the extended shutdown, it appears to be spreading quite rapidly
The idea that the measures aren't working is a premature one. We won't know if they have worked for a while yet.
The problem was already widespread before the controls came into effect.
The disease was first identified in early December and the Chinese government took the decision to build a 1000 bed hospital and shut down the city when only 500 cases were officially identified. That's a disproportionate response at that point - they had to have a fair idea it was much worse than that.
It was clear at this point it was probably already out of control.
Due to the incubation period and the fact that some areas were shut down earlier than others, you would expect the numbers to be going up still. Plus there the hospitals in Wuhan were clearly overwhelmed at the point controls were put in and couldn't take in and medically quarantine early cases (which is precisely why the controls were put in) meaning it spread in families and close associations even after lock down.
On top of this the sheer density of population is always going to be a particularly Chinese problem. If a tower block has one family with an infection, can that spread to neighbours (with SARs people who were in rooms adjacent to a carrier were infected and a block of flats had a spate of infection which was put down to shared sewage so there is this fear that lock down might not be 100% affective.)
If the measures have worked then the earliest this would show up would be a fortnight after they were introduced.
The reality is that was always unlikely to show up in figures after only a fortnight due to the fact that services were already so overwhelmed at the point of shutdown and there were large numbers of unidentified carriers.
I suspect its more likely going to be closer to a month before there is any indication of the situation being under control in Wuhan itself through the quarantine and shut down controls.
Also the number of diagnosed cases going up is a fundamentally different thing to whether the situation is under control and being managed. You'd expect reported cases to go up after the situation had come under control due to authorities processing a backlog and getting even more draconian in control measures as they got better at identifying and reporting suspected cases too. The numbers of cases only mean so much and its important to understand this.