A test like that can only ever be a first indication. If you score high on this, it doesn't mean you're autistic. It just means you might want to talk to a mental health professional.
Sadly humans always want to boil things down to simple metrics (or maybe we just like numbers... wait a minute!) and people can't be bothered to do the hard part after getting the number. The classic example is IQ tests, which just measure how good you are at that particular quiz (despite certain people obsessing over them like the number is your IRL intelligence stat).
I didn’t take this test, but another similar 50 question autism test, but I felt the same way. It reminds me of alot of the personality quizzes they give for the different business personality trends out there. Questions where there can be some nuance involved and I can answer the question either way depending on how I frame it, but the answers only allow for one answer or the other. I could literally flip a coin to pick the answer and not be wrong, but somehow one answer will make me more autistic than the other?
Criticism of psychology tests aside (which is totally valid), do also note that this one is based on the work of Simon Baron-Cohen, whose theories on autism have been proven wrong one after another and miseducated a generation of psychologists.