I agree with @Tom Ott and @Chris Clothier, I don't think this is truly a turnkey. As Chris said, the term is overused a lot. Some companies advertise a property as turnkey meaning that it is "ready to move in". A true turnkey does all of the work on their time and dime. The turnkey company has
networks and systems in place to find the best properties and rehab to a high standard and
quality. This also means that you won’t have to worry about vacancy risk during the rehab
process.
Closing happens after the rehab is finished and inspections are passed, this means that you won’t have any risk during the rehab stage. The turnkey company benefits from the spread between what they put into the property and the market price they sell to you. The price you purchase the property at should be market price, a reputable turnkey company won’t inflate their values and third-party appraisals should back up the prices.
Best of luck