I have been told that when the dog goes on point and then even moves a slight muscle to launch the bird out of the launcher at that moment and that it will end up teaching the dog to hold point and not creep....

Here is my thinking....to me it seems like you would be rewarding the dog for creeping as when they do the bird flys, you shoot it and they get the bird. To me I guess I would think the dog would figure out that if the bird flys they get it thus they would want to creep more???

I  want to get a bird launcher but want to make sure I understand how it will really help in dog training for birds. 

Thanks for the input in advance!

You should use strong fly'n birds so that the dog has no chance of catching the bird once you get them to hold then you can start to steady them up to the shot and fall