I believe the statement is false. My reasoning is the word "appositive" is another term for apposition and after reading the definition of this word it sounds like a description of a synonym and not an adjective.
An appositive, or apposition, is actually a noun or noun phrase that is used to rename some other noun that is right beside it. It can be a short or long phrase, or a single word. Check the example:
The insect, <u>a beetle</u>, was making a weird noise.
