The print on the eBay listing does seem to have a Dolby Digital track in between the sprocket holes. But I agree that it would easier to use the laserdisc audio.
We don’t know if it will run or not yet though. It could quite literally be worn out now, Toy Story was a big hit and each print will have had hundreds of shows. If it still works you can record it off a projector.
Did projectors have toslink/spdif out back in the day to allow for this?