I think anyone who has driven a manual transmission for performance knows/feels engine braking is 100% a thing. Drop the gear to the lowest you can without red-lining (80mph?, drop to 3rd), then 100% brakes. A lot of momentum/energy is absorbed from pushing all the components of the transmission, flywheel and engine at a disadvantageous gearing. Similarly, if you were to put it in neutral and try 100% braking it’d take much longer to stop. That difference is the engine breaking.

How old are you? If you’re still young keep an eye on that.

This has to be a lame marketing attempt.