No. The assessed lesson was introduced to the accreditation pathway as an important part of ensuring training standards and consistency, and it is therefore essential that the ART Assessor is independent from the mentor.
If you need help finding an independent ART Assessor, then see here: Find an ART Assessor.
Help Centre Topics: Accreditation & Assessment / ART Training Scheme Module 1 / ART Training Scheme Module 2C / ART Training Scheme Module 2F