Sometimes, particularly in the optimisation space, the clarity of the resulting code is a factor along with absolute performance - ie how easy is it for somebody looking at it later to understand it.
And what is 'understandable' could be a key difference between an AI bot and a human.
For example what's to stop an AI agent talking some code from an interpreted language and stripping out all the 'unnecessary' symbols - stripping comments, shortening function names and variables etc?
For a machine it may not change the understandability one jot - but to a human it has become impossible to reason over.
You could argue that replacing np.column_stack() with np.vstack().T() - makes it slightly more difficult to understand what's going on.