Theo, an Amazon seller, is adding a product to his inventory list in Seller Central. He knows his product is eligible to sell because he has seen that product on Amazon in the past. Is Theo correct?

Yes, it is safe for Theo to assume the product is permitted.
Not necessarily. Theo should not assume that a product is permitted just because it once was.

The correct answer is:

Not necessarily. Theo should not assume that a product is permitted just because it once was.