It's hard to say it's a cure and they don't even say that.
It modifys existing T-Cells, but the stem line will still produce T-Cells without the disrupted gene, thereby requiring continuous (and profitable) treatment. Unless it enables the body to completely clear the virus,you can't call it a cure.
But it sounds great, as it appears to have the potential to to allow the body to suppress the virus so that the individual is healthy and non-contagious.
This approach might lend itself toother therapies against other viruses, which, like the HIV, need a portal of entry into a human cell.
I wonder if this company can patent not just the new enzyme, but the whole works and sew up the general therapuetic approach.