Notice his car is one thats been heavily modded, and more strain will be placed on the engine mounts if your getting more torque from the engine. Id sit up and take note if your warranty is nearly up with vw incase the worse may happen.
Thats quite shocking. There is no other reason that could happen. thats torque stress of the bolt. Hurdy-vtec,gaz, take note, get yours checked at some stage.