I've seen FX TD job postings from ILM that mention Houdini. So why isn't ILM on the list of companies that use Houdini?

In general, lists of *anything* on the web are incomplete. But anyhow, if you're talking about the Houdini Jobs page, it's not meant to be complete in the first place.

ah but just mentioning Houdini in a job posting doesn't always mean that the company /uses/ Houdini…

Ok, let me put it in a different way.
Does anyone know if ILM uses Houdini?