Yes. Replays are telemetry files, not video files. They require Gran Turismo to reconstruct the replay from the telemetry, which would require the website to have Gran Turismo software capability.Any good reason why granturismo.com doesn't have video player for replays???
The replay works on your console because you have Gran Turismo installed on it. If you want to watch a replay on your laptop or smartphone the scene would have to be rendered on your own device, which means you’d need to have the Gran Turismo render engine and all the assets installed there. That’s probably somewhere between 100 to 200 GB of data.Replays work on PlayStation console, they could be made to work on PlayStation.com or GranTurismo.com