Question 1
Why did you put 'controlled experiment' in quotation marks? what is the difference between a 'controlled experiment' and a controlled experiment?
Question 2
The standard definition of the word "empirical" does not require a controlled experiment, or for that matter, any kind of experiment at all. Why do you feel justified in changing the definition of a word (any word, but in particular this one), and then complaining when the rest of the world does not use it your way?
For standard usage of the word "empirical", see for instance the
definition from the online Merriam-Webster dictionary.
Case in point
I quote from the book
An Introduction to Scientific Research by
E. Bright Wilson, Jr.; McGraw-Hill, 1952 (Dover reprint, 1990); page 27-28, section 3.7 "The Testing of Hypotheses"; emphasis from the original.
"In many cases hypotheses are so simple and their consequences so obvious that it becomes possible to test them directly. New observations on selected aspects of nature may be made, or more often an experiment can be performed for the test. There is no clear cut distinction between an experiment and a simple observation, but ordinarily in an experiment the observer interferes to some extent with nature and creates conditions or events favorable to his purpose."
Wilson says "
There is no clear cut distinction between an experiment and a simple observation," and that is the way the entire scientific community currently operates. Are you now telling us that the entire scientific community is using a flawed concept of empiricism?