Yup. One or two have let go at 400hp, let alone 500
The internet is a funny place. A handful of people get away with adding 200+hp to a standard engine for 6-12 months, and that earns it 'bomb proof' status
Show me a 500hp Golf R that's done 100K miles on stock internals, that hasn't been show queened or only driven to and from the shops, then I'll change my mind