Fun fact: that's not how humidity works. It, in fact, DOES help to get water to evaporate by forcing the local humidity around the phone to stay low. Otherwise you may as well say all the people doing 3D printing that use desiccant to keep water out of their filaments are fools, too.
What it won't do is magically erase any gunk or minerals that were in the water that can short out traces on unprotected PCBs and chips even with the water gone.
So, yes, it is not magic that can fix any phone that saw water. Though it absolutely helps to get the water out of the phone. ... I mean, unless you live in a desert where the humidity should already be sufficiently low most days.
I don't know why you feel the need to turn the truth in to a joke. /s