1. He never said he wants to "round up" people and place them in wellness farms. He said that if you are convicted a crime, this would be an alternative to prison. If this was said by someone on the left, it would be seen as pushing for restorative justice over punitive justice.
2. He never said people going to these wellness farms would be denied their prescription medications. He said they would go off illegal drugs like fentanyl (obviously), and that they could also try to reduce their reliance on prescription medications "if they wanted to". Plenty of people in this country are overmedicated and on multiple RXs that they are addicted to and have difficulty coming off of.
The discourse around his intent here is just completely paranoid and/or dishonest.