Earlier quoted context omitted.
Perhaps reading code activates the same arras as reading prose in English, but running code in your head activates other areas
Reading code and not running it is like reading a Spanish text but not knowing Spanish. Running it is equivalent to comprehension.
Interpreters run your code, but they don't 'understand' it any better than compilers, which don't run your code.
In a sense, compilers typically 'understand' your code better, allowing them to do more optimisations.
(The boundaries in practice are more blurry.)