For example, Sleep Talk + Rest.
While a Pokémon with this Ability has a status condition (non-volatile status), its Attack is increased by 50%. Additionally, a Pokémon with this Ability does not lose Attack due to burn.
source Sleep is a non-volatile status, so it should activate guts.
Yes, that is why Sleep Talk is somewhat viable on guts abusers in tiers where sleep moves are common.