Effectively HIV stops replication in a presence of the drug, similarly to HIV drug regimes used today. However HIV is a very nasty virus - it’s called retroviru

Effectively HIV stops replication in a presence of the drug, similarly to HIV drug regimes used today. However HIV is a very nasty virus - it’s called retrovirus because it writes itself into cell’s DNA (nucleus/core). So while those cells are alive as soon as you stop taking medications you will have virus resurgance. Some of those cells are in bone marrow and permanent. Hence stopping the replication of HIV isn’t enough for cure.