Shill
Shill is an informal word that is used disapprovingly to mean “to talk about or describe someone or something in a favorable way for pay.” It is usually paired with for.
// It’s very common to see influencers shilling for different brands on their social media accounts.
EXTRANEOUS
Something described as extraneous does not form a necessary part of something else, and may also therefore be considered irrelevant or unimportant (as in “extraneous details”).
// The woman who reported the robbery kept bringing up extraneous facts, such as what she'd had for lunch.