I don't think either is total bs but there is bs in both circles. How else do you explain the bs going on with the Rona?
As to flushing- IMHO, you need to remember that legal weed is being treated a whole lot stricter than any other food products. If you have to submit to testing and you use salt nutrients and no flush there is a real chance you will fail. If you use organics in pots, beds You will prolly be safe. If you plant in the ground- the soil could be contaminated from some previous use. If you have another farm close by you could get screwed because they are using a spray that's banned for weed but is ok on oranges.