These articles are often from altcoins to support their argument, those currencies in which the developing team holds most of the liquidity. Therefore, the easiest thing is to say that this design is the same as that of Bitcoin, and that the miners are mining a pre-existing Bitcoin, which supports their claims by saying that there are only 21 million Bitcoins, and therefore it is It has already been mined and all these beliefs are incorrect and not accurate.
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I agree that there is truth in what you wrote, although there is also a lot of ignorance that results in this kind of nonsense. If the OP who has been around for a while wonders if there is any truth to this, what do those who know absolutely nothing about Bitcoin think when they come across this kind of information?
Not only is the coin that the OP is talking about premined, but as far as I know, there is no defined max supply yet, and it has also moved to POS. When you take all that into account, it's no wonder that someone invents stories like this to diminish the real value of Bitcoin, and I don't mean exclusively the price.