I would agree that the article linked to is of limited use and verging on a con-trick.
Similar, or perhaps the same, devices have been promoted here in the UK.

Might possibly be worth considering in damp and a humid regions, if you need a dehumidifier anyway, why not get one that produces potable water ?

For general use though it would be much better to store both drinking water and the means to procure and purify water.