You miss the point. If you read section 19 that I posted above theoretically someone could complain that the hopples placed on most young horses cause the issue as described.
Essentially, unless there are new methods, the hoppling of a young horse inevitably causes issues with broken skin and often resulting in bleeding or discharge.
Here is what MPI can do about it:
https://www.mpi.govt.nz/animals/animal-welfare/regulations/guide-to-the-animal-welfare-care-and-procedures-regulations/
What you need to do
Most of the regulations are based on current practice or existing minimum standards in the codes of welfare, so if you're already doing it right you won't see a lot of change. But some people may need to:
change their practices
provide additional staff training
make other changes to the way they care for their animals.