NB. "Withdrawals" here means what the article calls "redemptions". It means recovering the fiat currency that one surrendered in order to participate in the Ponzi scheme.
Bitcoin could have "collapsed" weeks, months or years ago, but how would anyone know. A Ponzi scheme can be undetectable until the victims try to withdraw their funds.
As long as websites publish a purported "quote" then people reading may continue to believe it. People can argue about the "value" of BTC until they are blue in the face (watch for the replies to this comment) but until they actually withdraw the funds they committed in real money to participate, let alone any purported gains, it is all speculation. There are no guarantees because crypto is unregulated.1
These crypto entities are not required by law to disclose anything. How does anyone verify if what they disclose is actually true. If someone believes BTC is truly worth what is published on CoinMarketCap, then they should try cashing out and prove it.2 The ones who cash out early will get their money, but if enough people try to cash out in a short period, then the Ponzi scheme will be exposed. The schemers cannot cover the withdrawals. Most BTC owners will lose their real money.
But then, who wants money when one has BTC. If one believes in crypto then perhaps one believes money (fiat currency) is ultimately useless.
Tether had to be sued by the NY Attorney General for it to release basic information. Ths sad reality is that the only effective means to getting information about what crypto schemers are doing has been to bring civil or criminal proceedings against them.
1. With respect to the US, crypto is unlike shares of stock, the issuance and trading of which must comply with securities laws. Tether is not registered with the SEC.
2. "Cash out" here means convert to real money (fiat currency). The article refers to this as "redemptions".