Yeah, I looked at the data that's been shared here so far and that seems to be the case. Nobody has reported an interview with a UCAT lower than 98th, and some of those have been top-ups. Pretty bizarre method!
It’s not really a bizarre method! UAdel, JMP, and WSU all use it for giving out interviews (ATAR hurdle or not considered at all), and UQ use it for offers (ATAR hurdle). What could be bizarre is they’re only going down to 98th percentile, but that clearly represents the small amount of spots on offer for interstate applicants.
ETA: also, we’ve had a number is MSOers recently assume an ATAR conversion for their IB/A levels without actually checking and simply reporting here that they’ll have 99.95. I think this user is one of them. It may be accurate, but it may not.