Not true in any way, knowing what clusters a device uses sheds no light on the available parameters, their values and what they're used for...
Granted it breaks this app, I get that.
I've just got my Hubitat hub working today after sourcing a missing USB cable. Porting my Z-Wave Tweaker is on my plan but not top of my list, so maybe give me a month or two.
... in the meantime, if anyone's made further progress please get in touch.
It doesn't appear to have been mentioned in any of the posts above, but Mike did create a "Basic Z-Wave Tool" for Hubitat that serves a similar purpose, though it doesn't appear to do quite as much (setting associations, etc.): Super basic Z-Wave parameter tool. I've only used it to change Z-Wave parameters if the driver didn't expose something directly. Good luck with your porting efforts--there are a few threads on the forum you can search for about differences between ST and HE that affect code-writing if you haven't seen them already.