That's difficult to believe.
The Taliban is conducting an insurgency. They cannot operate without at least the tacit support of the vast majority of the population.
With a 1% approval rating they would have to operate as do the Western forces - from heavily armed and protected strongpoints, protected from citizens, travelling in larger armed convoys, supplied from afar. They couldn't survive fighting a guerilla war.
The Taliban has the support of much of Pakistan's power structure, which would seem to flow from support from below.
On the surface, compared to the situation, one would have to see some of the rawer data to have a lot of faith in that poll. Hell, George W. Bush never did sink below 20%.
Arf