Actually, not exactly. External examiner is one thing. Making entries anonymous means the examiner does not know whose paper/work they are assessing, regardless of the fact if they actually know these persons or not. The entries are emptied of any personal data and numbered, that's all. Combining external examiners with entries anonymisation makes it kind of a double blind. It is used because "external" does not mean "unbiased" so the procedure makes sure the examiner does not know and have no way to find out whose work they are assessing - but as this is off topic, let's just leave it hereIt's just called an external examiner. They bring someone who doesn't teach in the institution to evaluate the students of said institution. Very common practice.
In case of FS scoring, the judges are not really external and the entries are obviously not anonymous so the risks of bias is as high as possibly can be, no matter what we personally think of judges integrity. From the point of view of scoring methodology, this system has no built-in anti-bias precautions whatsoever and therefore its credibility is objectively very, very weak.