Well, if your description of the process is correct, then there is no weather modification going on. Any changes made to the ionosphere would not be translated to the troposphere (where our weather occurs).
The two are separated by 50-80 miles, which may not sound like much, but the troposphere is only about 5-7 miles thick. There is also very little interaction that goes on between the different layers of the atmosphere, that is why the layers remain intact.
Plus the amount of energy the ionosphere is absorbing from the sun is probably millions or perhaps trillions times more than man can create with low frequency waves. So it would be like saying I am modifying Lake Superior by tossing a rock into it.
I suppose it made for good late night cable TV viewing, but is not scientifically correct at all.
-John