Typically yes, this means the person assessing you should have no knowledge about you or your application.
However, it’s worthwhile clarifying with the firm or with other people going through the process. Sometimes just certain information is “blind” such as your school, and university - it’s not all blind, but is enough for the employer to claim it to be. The assessor could have information like your motivational answer a to why you have applied to the firm, but may not have access to the “factual” stuff like where you have studied, what you have studied and the grades you obtained.