I have heard that. As someone with a lot of lubricant experience, I know that modern day ATF is not like the ATF of yesterday... Err. Yesteryear.
I will admit to topping it off with Dexron III for the drive home after purchase, simply because it was low and howling as a result. In that instance, any fluid beats no fluid. As it turns out, the low pressure line is actually loose at both ends. - It spins rather freely on each nipple. Gee, I think I found the leak.
I'll be flushing and filling it with basic power steering fluid.