TLDR: 'measured' is parallel to 'valued'
This sentence can be simplified to:
This is particularly true for people who have been valued [...], or measured [...].
, or doesn't need a comma. In fact, we can take it completely out of the simplified sentence I just wrote:
This is particularly true for people who have been valued [...] or measured [...].
However, the author was being kind and provided us the comma
(,) because there is another instance of
or in the sentence, and did not want to confuse the reader, otherwise the sentence could have mistakenly be read as:
This is particularly true for people [...] or the educational system or measured [...].
and this would confuse the reader, who would have to read the sentence again to understand what the author meant to say.