The reasons why cats should not approach a coffin after a person has died are as follows:
After a person dies, the nervous system does not immediately stop functioning, and a lot of anions are produced in the body. If anions encounter cations, there will be a bodily reaction that can harm the corpse.
Cats carry a large number of positive ions. If a cat is allowed to approach a deceased person, the negative ions in the deceased person will react with the positive ions in the cat, which may eventually cause the deceased's body to move.
