Screen stories are structure-first, which is exactly what an originality check reads.
A film premise is evaluated the same way any other narrative concept is: by the shape of the story rather than its subject matter. Two scripts about completely different subjects can share a spine, and two scripts about the same subject can be structurally unrelated.
The clearest recorded demonstration of this is the amnesiac detective check, which named Fight Club, Secret Window and Angel Heart - three films - and for each one stated the specific shared mechanism rather than a general resemblance. That is the same reading a screenplay premise gets.
Almost every produced film shares tropes with dozens of others. What makes a premise derivative is the arrangement - the same elements arriving in the same order, doing the same job. The chosen-one check shows this distinction being made explicitly, and shows the verdict staying blunt when the arrangement is close to a known skeleton.
It will not tell you whether a script will sell, whether the market wants it, or whether the execution is good. Those cannot be read from a concept. It identifies the gap; it does not write the screenplay.