Yes, according to the T&C (General Terms: H), it would be a qualifying Advantage purchase which resets the mileage activity:

“'Qualifying Activity' is defined as redeeming any AAdvantage® award or accruing mileage credit on any eligible purchases with American Airlines or AAdvantage® airline participant as well as accruing mileage credit with participating hotels, car rental companies, credit cards, and other service providers offering AAdvantage® mileage credit. Qualifying Activity extends the expiration date of all unexpired mileage credit in your account for 24 months from the date of the Qualifying Activity."