Oh I don't just believe that one link. I've done multiple side by side grow tests with identical clones grown in identical conditions until the point of "flushing" at which point the test samples were only given water after "flushing" the medium clean in a hydro system. While I didn't have the ability to have tissue samples lab analyzed like they did in that study, I was still shown that there was no significant difference in the plants that were flushed vs not. They lost a little bit more leaf color, but otherwise were pretty identical.
I'm actually all for people feeding just water the last week or so if they want to save some money on nutrients. HOWEVER, it is not removing anything from the plant which was the first point I made to you. Also feeding with just water isn't "flushing", its just watering without nutrients....... Flushing always meant running EXTRA water through your medium to lower the nutrient levels in the medium. It actually has a purpose when growing if you overdo the nutrients early on. But it never removes anything from the plant, just the medium and it CAN DAMAGE ROOTS which may slow growth so its better not to over feed in the first place.
You can google all you want, but I've never seen an actual botanist or agricultural specialist encourage "flushing". I don't mean some cannabis "expert" or "master grower" I mean a real scientist. Which is infact why I like the Green RX study, it was done by real scientists, not just cannabis "pros". There is a reason no other crops get "flushed", and its because it doesn't do anything.