Yes, qualifications needed by the employer are NOT a basis for TN. It is a job description meeting those of the TN category that count. Only then is your education looked at to see if you qualify for TN.
Example, a pharma company may wish to hire an MD to head up a sales team for a new drug. So THEY want a Doctor. But the job is sales. No TN would be granted to this Doctor, since the job description is salesman, not Doctor.