I think you hit the nail in the head with your question. Since "turnkey furnished" could be left to interpretation. I suggest that your agent make an inventory list of everything inside the property and submit it with the offer.
I can tell you that a lot of buyers have been left in the dark because they see a property with certain features (lamps, appliances, furniture) and then are surprised to see things switched at time of closing.
Write down even model numbers where applicable.
Turnkey furnished is ready for rentals with furniture, linens, silverware etc.
The selling agent or the property management company renting the home should have an inventory list.