Those titles help a lot. I wonder whether the Reddit poster saw titles.
With titles, some people will be dim or troubled enough to give the wrong answer on obvious ones, like "Starter Not a Finisher".
The right answer on other questions are trickier. Like maybe the company wants a handler of packages to be willing to toss the packages around "Good Enough", and some manager thought some people are a natural at that, and asked for a test to tell them. (Like when a non-technical executive was suggesting that I should give coding exams to senior software engineer candidates, and the strongest point in the argument was "This will tell us whether they do unit tests!")
Could titles be tricky, like if "Loves the Social Scene" is paired with image of someone partying hard, so the company might think they'll have hangover absenteeism, OUI, or other risks?
Or risk of insubordination, or disruption to the hierarchy? A self-image of "Natural Leader" in a worker-bee role could be seen as problematic by a simple-minded company.
Maybe Fedex is gathering data on which combinations of answers predict a unionizing troublemaker. Or, in the scenario that a shop floor employee is injured, which employees are going to be murmuring about it with others, speaking with investigator, etc.
If a company wants to be especially evil about it, some of these questions might be good for weeding out candidates with depression. Or for arguing pre-existing condition, if an employee later claims that working conditions caused mental anguish.
Then there's the meta of filtering out people who are alienated by this test, or who are not captive. Especially with the odd images in this test, I think many candidates with self-respect and other options will simply walk away. It's not like Leetcode hazings, where they've been conditioned since school that this is just the ritual you do to get that very-well-paying FAANG job. This is some different thing, to which you're submitting for a chance to work at FedEx.
What other possibilities?
Some of that could be useful to a company, if not very ethically. Also, maybe this was sold to the company as more than it is, based on flawed or fabricated psychological research.