The problem with this, baths/dip, is ich and other parasites can live in fresh water a lot longer than the fish can. Not to mention the ich and other parasites are inside the fish body or gills. So the fresh water bath will not have an effect on them. Also in his article he is using 37% food grade formaldehyde in the bath/dip. It usually take a number of bath/dips over a series of days for this to work and you need to be careful with handling 37% formaldehyde.
In the end bath/dips are better than just placing the fish differently into the tank but it's still not good enough.