There is 1 above row, and FALSE plus UNKNOWN rows make 3 dropped rows.
above rows=1
BETWEEN examples are tiny finite-table transforms with SQL-style TRUE/FALSE/UNKNOWN results; SQL dialect completeness, type coercion, optimizer behavior, indexing, and product claims are out of scope.
Above is not TRUE
The above row is visible in the range facts and absent from the output rows.
above drops
Summary
Below and above both fail the positive BETWEEN check.