d.putBoolean( s2t("makeVisible" ), false ); The layer is not hidden?

There is a piece of code that selects a layer:

.....

r.putName( s2t( "layer" ), "My layer" );
d.putReference( c2t( "null" ),r );

d.putBoolean( s2t("makeVisible" ), false );

.....
Why does d.putBoolean( s2t("makeVisible" ), false ); not hide the layer.
If I write:
d.putBoolean( s2t("makeVisible" ), true );
The layer from invisible becomes visible.
If I write:

d.putBoolean( s2t("makeVisible" ), false );
The layer is not hidden?
Could this be a feature of my version of Photoshop, or am I misunderstanding something?