Confused about yellow contingency

The message to the facility directors states that the yellow contingency means to kill all personel who know to much information. However, the token states that all players that have 4 or less knowledge will be killed. Surely that is contradictory as the crew who have the highest level of knowledge are allowed to live whilst those that know less are killed?

I am overthinking this way to much but can someone help me out please 🙏