Disclaimer: I know absolutely nothing about quantum computing.
However, if it was really a threat to cryptocurrency I would think that the biggest of big crashes would have happened after the first announcement. Unless there was something new in this second one that pointed toward bitcoin being at risk because of quantum computing, I just don't see it as anything more than a coincidence.
I'm still thinking the Celsius freeze had something to do with the crash we're seeing, even if the crash started first. I'd also point out that it's not only the crypto markets that are down a lot. The stock market in general took a big hit today, and precious metals were even down. This could just be a huge selloff of all kinds of investment assets.
I remember that after the first reports about quantum computers and their capabilities, opinions immediately appeared that quantum computers may not reach such powers at which they will be able to crack the security codes of cryptocurrencies. In addition, it was stated that if this happens, then such computers will not be owned by individuals, so that there is no possibility of misusing them. This could reassure many cryptocurrency holders. But some time passed and the power of quantum computers began to grow quite rapidly, and experts also predicted that quantum computers would become dangerous for cryptocurrencies in the next ten years. The article referenced by the OP does not in itself indicate the danger to cryptocurrencies from quantum computers and therefore is unlikely to be a reason for a sharp drop in prices in this market. I agree with the opinion that, most likely, there are several such reasons, and only in sum they give such a negative effect. However, if it was really a threat to cryptocurrency I would think that the biggest of big crashes would have happened after the first announcement. Unless there was something new in this second one that pointed toward bitcoin being at risk because of quantum computing, I just don't see it as anything more than a coincidence.
I'm still thinking the Celsius freeze had something to do with the crash we're seeing, even if the crash started first. I'd also point out that it's not only the crypto markets that are down a lot. The stock market in general took a big hit today, and precious metals were even down. This could just be a huge selloff of all kinds of investment assets.
