Have they factored 21 yet? [0] IMO most of us can ignore such pieces until a practical factorization of arbitrary 32 bit integers is demonstrated on a QC. And even after this "easy" milestone is achieved, I think it will be at least a decade until QC will be a practical cryptographic threat. And it's generously assuming that a Moore-like scaling is possible for QC.

[0]: https://algassert.com/post/2500