Who the hell cares who's she's employed by? She conducted a valid scientific study and the results are there for all to see. You probably didn't even read the study. Some of us believe in science not some voodoo thought up by a bunch of stoners.
And it's not just that study. Anyone that knows anything regarding plant science knows that the primary function of flowers is to reproduce. If you take what it needs away from the roots the plant will move stuff from other parts of the plant and move it to the flowers. Nothing leaves the flowers. You can't flush anything out of the plant. All you can do is starve it so it cannibalizes itself.
Answer this simple question. Where do the nutrients your flushing out go? They don't travel back down into the soil through the roots and they don't drip out of the flowers. So where do they go?
Plant tissue is made of elements. Nitrogen, calcium, phosphorous, etc... are elements. How do you flush away plant tissue?