He's not joking though, they really say that in the PDF linked below. "Steam navigation brings nearer together the most distant nations. ... their theory is very little understood, and the attempts to improve them are stil l directed almost by chance. ...We propose now to submit these questions to a deliberate examination. -Sadi Carnot, commenting on the need for a theory of deep learning"

It's probably a typo, it'll get corrected. It should probably say "a theory of thermodynamics" or something similar instead of deep learning.