Check their website for info on it. I would suggest if is more likely your growing conditions than the nutes that is holding up your plant if you think it should be further along. Light, temp, humidity.
Yep, this is the conclusion I am coming too after researching it. I have been looking into this drowning method to start the curing process before harvest which interests me. But flushing for a week or 2 when buds are filling out is madness in my book and does not do much apart from clean the media and force the plant to drag nutrients from the leaves as it stresses out. I currently plan (plan changes constantly as I research more) just to fade of the nutes a little if media has enough stored, fade out the lights, drop temp a little and drop the 12hr to 11 over the last week or so to encourage it to finish properly by mimicking to some degree the real world, but ultimately let the plant tell me what it wants. Then 72 hrs dark, cut and hang, dry for as long as it takes in optimum conditions in a tent and then cure to optimum RH in jars. From what I have read the taste and smoke-ability is almost always down to the dry and cure process as long as the plant was grown relatively well in the first place. I mean a do a mini flush on most waterings anyway, using coco, worm castings and charge as my media. Idea is to keep media optimum at all times so flushing is not necessary for whatever reason. Does that make sense to you?