"3Delight IS a Renderman compliant render engine."

Doesn't that only mean that it uses Renderman's shading format?

3delight does indeed use RSL (Renderman Shading Language), though 3Delight does have some extensions to it. Note there are, that I am aware of, two GUI based interfaces in software that can create RSL code. One of them is in DAZ Studio, the other is from Pixar and costs $1000.  However that is not all Renderman compliant means. It is a set of standards, math and equations to make a render engine. :)