I have x10 stuff, it says the same warning on dimmable lamp modules, No flourescent, No apliances-motors. But I have had one lamp module on a small fan for years that I wanted to run slower than its low set speed, with no failure or overheating and I use them on flourescents. Alot of warnings are for liability and missuse, if logic and care is used you have more options.
**************************************************I had a X10 module controlling a 1/3 HP hot tub pump a lomg time ago. One day IO looked at it and relized that the module I was using was a lamp module, which had worked fine for many months. I did quickly swap in an appliance module.