I would suspect the claim is using a specific understanding of "break". Obviously you can break a human mind with a bullet or a chisel through the eye socket, but there are certain types of breakage that are not possible without much more nuanced understanding of how the mind functions.

In general, I think the idea is that when we learn to create a type of thing, we also learn a great deal about new ways to destroy it.

But OP is claiming that some of the techniques used to break minds can be used to cure PTSD. Some of us are skeptical, and OP gives no reason to think that the 'two sides of the same coin' adage is applicable here.