The correct statement should be "honey of A, arsenic of B".
"A honey is the arsenic of B" is a Chinese proverb, which means that the same thing has different meanings for different people.
For one person, it may be what he wants, but for another, it may be poison. This sentence vividly compares different people's different views and feelings about the same thing.
Therefore, "fake candied fruit is arsenic" does not have an exact meaning.