On the contrary. Culture fit is a pretty normative term: It says to me, we act like THIS at this company, and we're looking for more people who act like THIS. It's pretty explicitly anti-diversity, and speaks to a search for cultural homogeneity.
Psychological safety is less normative: It's about being in a space where it's safe to voice an opinion, and feel that you're heard and valued for your contributions. It's a term that can apply in a very culturally diverse team.
Maybe in theory, but in practice? Either the team has a shared culture of open-mindedness, or a culturally diverse team will have opinions which are held by some and taboo for others. Either way, you need a common culture, even if it's fairly broad and flexible.
Psychological safety is less normative: It's about being in a space where it's safe to voice an opinion, and feel that you're heard and valued for your contributions. It's a term that can apply in a very culturally diverse team.