Yes, IBL did work in 11 and 12 and I can't find where in the manual that it states superfly doesn't support it.

https://www.youtube.com/watch?v=J_paY90kz40&list=PLHskz2PNix3A5yg-x4tRQF5xPWPsRV5Q5&index=9

Video from Poser 11 (SM days I believe), around the 12 minute mark is when he explains how it works and how to set it up.

But a lot has changed since then and word has it SF is a complete rewrite in 13 so I'm sure that has something to do with it.