While "stop making stupid people famous" doesn't quite apply here, "stop making stupid posts famous" probably does.

After he clarified and recanted a HUGE number of implied points in the first comment, my take is it comes down to "currently used encryption may be vulnerable" - essentially an evergreen statement, either due to weakness in the implementation (eg weak iv) or weakness in the maths (eg new mathematical attacks). Neither of these are new or honestly even worth pointing out.

Other than crypto with immutable hashes, the rest of the internet would simply update their systems to mitigate any broken encryption (depending on the risk of the 'break').

TLDR: scary implications make a post popular, regardless of substance.