Something is "self-evident" if it requires no external information to make a claim. (e.g. "All humans are entitled to equal protection under the law.") That isn't the case here. Rather, that the body of prior shared external knowledge is sufficient that a statement can be taken as a given without needing to justify it within the context of the conversation. (e.g. "Rain falls from the sky.") In this case, Pakistan being an unsafe place for women (second only to Afghanistan as the worst gender gap) is sufficiently well-documented that the statement doesn't require further litigation.
[0] https://www.weforum.org/reports/global-gender-gap-report-202... (Table 1.1)