I don't exactly claim to know all stuff cryptography, but I've done a fair bit of studying on the topic recently.

1. Just because it can solve a problem however many times faster, doesn't mean that it can break 256-bit ECC.
2. These kinds of stories are always overhyped. Not only do the creators of this computer want to seem asif they're the best to attract investors, but also YouTube videos are often clickbait.

Don't get me wrong, diversify all you want, but this kind of feels like an uneducated overreaction.