It is quite commendable that this research is taking place, and being reported on.
But we ought to be aware that this lens can be focused on things that are not conventionally referred to as propaganda—and we need to be intellectually prepared for the consequences.
For example, the technique seems like it could also be used as a performance indicator for political or ideological purity tests for LLMs. Since corporate values are often quite misaligned with free expression, one can imagine how well that is going to turn out.