The word "score" has many meanings. One of them is "twenty." This use is old-fashioned.
Here, "scores" means "an indefinite number, roughly in the range of several scores." If you had the official German list of banned professions and counted them, you would get a number like 43 or 61 or 75... not a number like 3 or 5, and not a number like 523 or 897.
The writer could have said "dozens" and it would mean about the same thing.
Here are some other examples of use.
"As of 2022, scores of people have traveled in space."
"The English language has a spelling rule, 'i before e except after c,' but there are scores of exceptions."
"Scores of people have won the Nobel Prize in Economics."
I could think of scores of examples :)