Not in any very important sense no. The existing big bang theory made a big headline prediction and that prediction turned out to be correct, the theory is conf

Not in any very important sense no. The existing big bang theory made a big headline prediction and that prediction turned out to be correct, the theory is confirmed in this respect. Later experiments might see some details in the measured result the theory didn't get right, but this doesn't invalidate the theory at the coarse level because at that precision the new measurements still agree with the old predictions: the theory is still confirmed in the sense that its predictions roughly match measurements. Occasionally it happens that a new measurement of some detail comes up with a result that the existing theory cannot be easily modified to accommodate: only this represents a true challenge in the sense that if some competing theory easily explains the new result along with all the old ones that will then become the "correct" one. Without this other competitor, a theory found to not accommodate the latest experimental results will be kept on indefinitely as the correct and confirmed one, but only used within clearly delimited context.