They are right. Turkeys will go to open ares while it's raining. I've seen several gobblers standing perfectly still together during an all day rain. They were just standing in the middle of a pipeline not moving at all. They would shake every now and then, but that's about it. If it's a steady moderate to hard rain you may not have much luck. It may be a different story if it's light rain. I'm really not too crazy about hunting in the rain, unless it's for ducks.