Link wouldn't come up. Anyway, many places including here in the US have used chemical castration in varying forms for quite awhile. I've nothing against using it, but don't think it is a cureall. Not by a long shot. A pedophile is sick and their sickness makes them the most likely of criminals to have the highest rate of recidivism. Remember, they don't need their dck to cause harm.
That type of program has been used in the US to allow guys to stay out of jail. Not always a wise choice. So, simply put, it is a program that has some use, some varying success, and shouldn't be counted on to stop a problem.
Personally, I'm extremely liberal on jail reform and sentencing of offenses EXCEPT for pedophiles who are too often released early because full prisons need space for mandatory bull shit drug offenders.