The Panasonic AG-DVX100B IS supported by iMovie. I know because I just tried it. While this model is not specifically named, if you look at the Notes it says "iMovie works with most mini DV tape-based camcorders using DV and HDV formats. Use FireWire port for tape-based devices."
This camera is a mini DV tape based camcorder using the DV format and has a firewire port. I used a 9 pin to 4 pin Firewire cable for the connection. Switch the camera to VCR mode using the rear switch. In the camera menu system select AV IN/OUT SETUP, then go to DV OUT and make sure it is set to ON. After this iMovie will find the camera when you go to File | Import Media.