Is Kant's "proof" still valid?

"Mathematics, Philosophy, and the Real World" seems to say that Kant's "proof" is no longer valid.



Lecture 27 Describes

Kant's classification scheme, which confines metaphysical statements such as "every effect has a cause" to a category called a priori synthetic.

Kant's "proof" cites Euclid's "parallel hypothesis" which which physicists no longer believe holds "in the Real World".

Command and Control lessons for our negotiations with North Korea

In command and control terminology, the dictator for North Korea must make a Command Decision.
It helps that the military has seen what Vietnam has done.

Command Decisions are top down decisions.  Description of top down versus bottom is the topic of an article at https://www.managementstudyguide.com/top-down-versus-bottom-up-decision-making.htm