By definition a linear ring cannot intersect (except the first and last point) except for the first and end point, so this property will always return true.
[Visual Basic]
Overrides Public Function IsSimple() As Boolean Implements _
IGeometry.IsSimple
True if the linear ring is simple.
Missing <remarks> documentation for M:Geotools.Geometries.LinearRing.IsSimple
LinearRing Class | LinearRing Members | Geotools.Geometries Namespace