Thank you for doing the math for us ! I think it falls on the same category as quantum computers , it is so far on the future it's not something to worry about that now , and would make more economic sense to use this supercomputer to help you mine Bitcoin than to try to crack keys .
Discussion
But in reality, neither would make economic sense.
Don't trust, verify ❤️
I work as an engineer and in that world there is often an emphasis on not solving for hypothetical future problems years before they happen. I think you are right that things like quantum are nowhere near close to even looking like a problem.