Except the article precisely says that the change cannot be attributed to this single policy:

> Portugal’s remarkable recovery, and the fact that it has held steady through several changes in government – including conservative leaders who would have preferred to return to the US-style war on drugs – could not have happened without an enormous cultural shift, and a change in how the country viewed drugs, addiction – and itself. In many ways, the law was merely a reflection of transformations that were already happening in clinics, in pharmacies and around kitchen tables across the country.

Intellectual dishonesty seems to be on your side, this time.