All it does is try to address the immediate question, like above.
And in isolation.
For one problem, the solution is rapid deposits of sediment, instant death and quick burial.
For a different question, the answer is slow deposits, so the fish can swim away. Contradictions between the two answers are not a problem because all horses are the same color.
I learned this test technique a million years ago, in tenth grade.
For the hypothesis that all horses are the same color, you create three groups. The untested group, which currently has all the horses in the world; the tested group, which is currently empty; and the testING group, which is empty as we haven't started.
You move the first horse into the testing group. For example, a white horse. Ask, "Are all the horses under test the same color?" The answer is yes. Only one horse is under consideration right now, it's an easy answer.
That horse, having been tested, is moved to the testED group.
A new horse is added to the testing group. Say, a black one.
Are all horses in the testing group the same color? Well, yes. Only one horse is under consideration right now, it's an easy answer.
The black horse is tested, now, and moved to the appropriate group.
So far, two horses have been tested, and the test result shows that they're all the same color.
A third horse, maybe chestnut, is moved to the testing group. Conduct the test, sort the results.
Eventually, all horses will be moved to the testing group, prove to be the same color, and move to the tested group.
This is the exact technique creationists use to solve any quibbles with their theory. "I (or someone) has already proven that this is not an issue." Somewhere. Somehow. That one fact, fixed in isolation from any other problem...