Almost certainly nonsense. Similar things have been tried before, and as far as I know none worked. Reasons:
* If you have high humidity, you almost always have plentiful rain and water around.
* If you're in a desert, then there's extremely little for any device to work with.
* It takes absolutely enormous amounts of air to extract meaningful amounts of water even in favorable conditions.
* It takes a huge amount of energy, too.
* Any such scheme isn't reliable in any case, and especially unreliable when things are dry and you really need the water. It works best precisely when you don't need it.
* You don't want to drink water from any kind of dehumidifier. It may have started clean, but won't stay that way.
* If you have high humidity, you almost always have plentiful rain and water around.
* If you're in a desert, then there's extremely little for any device to work with.
* It takes absolutely enormous amounts of air to extract meaningful amounts of water even in favorable conditions. * It takes a huge amount of energy, too.
* Any such scheme isn't reliable in any case, and especially unreliable when things are dry and you really need the water. It works best precisely when you don't need it.
* You don't want to drink water from any kind of dehumidifier. It may have started clean, but won't stay that way.