The trouble maybe that the support in the blog post hasn't made it into a liquibase-hibernate release yet and so you need up build the plugin yourself. Part of the reason for not having the new release is that I haven't been able to test it out yet, so there may be some problems with it still. It's been a lower priority area for me than the core liquibase functionality lately. Hopefully with getting 3.0 out I'll be able to re-focus on the hibernate extension and other areas.
Nathan