lemme, I only have access to a BAe146-300 speed card and the speeds might be a few knots off compared to an RJ85 for the same weight. That said, it would appear they were far too slow for a glide. Speed for glide is Vfto + 30. Vfto for a 146-300 at 33000 kg is 165 knots, so best glide would have been around about 195 knots. That is with gear down or up, the only thing that would change that speed is flap selection and they wouldn't have been able to do that (unless possibly they already had Flap 18 in the hold).
For the glide, once you get the gear down, if you are unable to select flap, then you increase speed to maintain the 1NM / 1000' gear down glide profile. In other words that 1/1 profile is an easily remembered target that is achievable with the gear down rather than the best the aircraft can do.