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What's significant about this is not that it is a practical cure, but rather that a cure might be possible, and this opens up directions of research.
The idea is that someone with a compromised immune system, when getting bone marrow that has stem cells that cannot get infected with HIV, can get HIV out of their system.
The stuff described in the article shows the case of a very lucky man who got HIV out of his system by an extremely high risk method that was only taken because leukemia would have killed him otherwise.
Now, it brings the idea: suppose if someone were able to modify all existing bone-marrow cells to be immune to HIV and do so safely, that should cure HIV. The hard part is: how do you do it safely?
This is just like how 150 years ago, any open fracture almost certainly means loss of limb because you are almost certain to get an infection, which then leads to death if nothing is done. They knew that everything should be OK as long as the limb does not get infected. How to keep the limb sterile is the hard part, and that was not solved until antiseptics were invented.
Here, the challenge lays in how to make all the cells in the patient HIV-proof without having a 50% chance of killing the patient.
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