flushing is for fixing a substrate issue -- like pH or nute concentrations etc...
it does not ever change the mineral content of buds. blind taste tests show ppl can't tell the difference. it's a bunch of anecdotal nonsense from a time of esoteric, isolated growing and oddball theories abound. some ppl think burning their plant helps or tossing ice on roots, lol. same thing.. anecdotal.. no baselines no comparison just some "dude" having a feeling and an ego too big to admit what they did had no effect... caus ethat would make them stupdid.. (their feeling, not reality.. "stupid" is the selectively ignoring facts part)