I will admit that the intro price is a bit strange, but $29.99 is hardly false advertising since it is the true current price of the plugin. They could have made it $29.99 and not allowed you to use the coupon on it. Either way, I don't think it is a big deal. If you care about WUP, then as you say, it is the full price that counts. I really don't care about WUP so it does not impact me at all.
I was sitting on the fence about this one. I already have the other three Waves NX plugins. You may have pushed me over the edge.🤪