The table is advisory, hence the use of the term "may".
For example: it may not prove suitable for all styles of trimaran.
Examination of the righting lever curve will normally reveal whether
the craft has stability characteristics most like a monohull or a
multihull: the former having a modest metacentric height and angle
of maximum righting lever of over about 25°, whereas the latter
have a large metacentric height and an angle of maximum righting lever
of less than about 25°.