This is the problem with most non-clinical "personality" tests. They are quite easy to just fake it and get a specific score you want. Even the Big 5, which is probably the most scientifically sound "personality" test can easy be faked to get the personality type you are trying to get.

The science around the categories is sound (the relationship the categories have with work performance, leadership quality, etc.). But the problem is really the ability for one to fake their profile.

Think about it like the Love Language test. What the research says about a person's preference when it comes "Quality Time" category is accurate. But the problem is, you can just answer the questionnaire in a particular way and you can tell what group you will get. (Love Language test has other problems, but I'm just using it for comparison to "personality" testing here).

On the other hand, many clinical personality tests have robust validity scales to catch you faking good or faking bad. E.g. the MMPI is one of the more commonly used clinical personality tests for employment. Though, most companies would not use it because it cost a lot more money and you need a licensed psychologist to interpret it. But, a lot of money and research is put into studying clinical personality tests and the questions are often well-guarded secrets. All this makes it much harder to fake.