I already explained in reasonable depth exactly why it's bad advice - I can't spell it out more clearly than that for you.Hello AdoraBelle. I completely disagree with you saying this is terrible advice. How did you come to this conclusion? Have you tried this method? I believe this is a very safe means of establishing a tank. I've used it several times and wouldn't recommend it if I hadn't used it myself. It's obvious you've never tried it and if you prefer waiting several weeks to cycle your tank, then you're welcome to do it your way. Some tank keepers, like me, would rather enjoy fish from the start and the method I described will allow this with no harm to the fish.
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It's not about which way I establish a tank, or the way you want to do it. There are lots of threads in the cycling section of the forum if you or anyone else wants to learn more about why "fill tank with water, add fish, do some water changes" is advice setting people up to fail and fish to die.