An interesting quality of the images is that they all have a high degree of symmetry, which is only found in living things. So there is a built in bias.

A key point of Rorschach tests is that they are always the same plates, so there is a large body of literature and case studies specific to interpretations of each one. I think that like any sort of psychological inventory the results are extremely context dependent and require a trained professional to interpret. The trending stuff on social media as mentioned in the article strikes me as more akin to the pseudoscientific misappropriation of things like the MBTI to compare different people in a non-clinical setting, and AFAIU there is really no scientific basis for any such thing.