You gotta remember, ProVoice TGs (or ProVoice capable radios) will never show up in any way on a scanner (non-modified). It's not so much about the TG being ProVoice, but whether the radio is capable as to whether it shows up on a scanner. I've experienced what you referenced about dispatch being in the clear. For example, SO command calls aviation on the digital aviation TG, and you hear dispatch, but not aviation. Don't forget that Tampa/Hillsborough is partially ProVoice, not encrypted. Nothing in the db that indicates that Hillsborough is enc.
Motorola encrypted TGs/radios will produce the alien robot, so at least you know they exist. So, if Clermont was using an encrypted TG or radio, squad should hear it.