I really think in the best case, it's someone in charge of adding criteria to hiring decisions and they pick a personality test as a way to measure and fit a candidate into some box they've arbitrarily chosen for a role. In the worst case they're filtering out neurodivergent people but can't say that because it's illegal. They'll make up reasons like you're listing, but there's not much evidence to the efficacy of these test at evaluating those criteria.
Like 20 years ago, a company was taken to the cleaners because they used a test used by psychologists to evaluate mental health as a personality test in hiring. Now, people who make/use these tests are careful to only use them in ways that healthcare professionals don't. A side effect of that is that any test that would be useful for reliably measuring a candidate's personality/mental fitness would also be illegal. So a lot of these tests are bunk to begin with.
Like 20 years ago, a company was taken to the cleaners because they used a test used by psychologists to evaluate mental health as a personality test in hiring. Now, people who make/use these tests are careful to only use them in ways that healthcare professionals don't. A side effect of that is that any test that would be useful for reliably measuring a candidate's personality/mental fitness would also be illegal. So a lot of these tests are bunk to begin with.