Ash.Sort.runtime_sort

You're seeing just the function runtime_sort, go back to Ash.Sort module for more information.
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runtime_sort(results, sort)

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A utility for sorting a list of records at runtime.

For example:

Ash.Sort.runtime_sort([record1, record2, record3], name: :asc, type: :desc_nils_last)

Keep in mind that it is unrealistic to expect this runtime sort to always be exactly the same as a sort that may have been applied by your data layer. This is especially true for strings. For example, Postgres strings have a collation that affects their sorting, making it unpredictable from the perspective of a tool using the database: https://www.postgresql.org/docs/current/collation.html