That’s disingenuous. There was a lot more to twinks having no battlegrounds after the separation than “stopped queuing”. They were scattered across 13 battlegroups back when battlegroups only fought realms inside their battlegroup. They simply were not self-sustainable under those conditions so yes, twinks did not get battlegrounds in most brackets in most battlegroups, but not for the reasons you claim.
Low level battlegrounds are not over populated in classic Wrath. The player base is split with classic era and retail so it makes sense to keep them in the same queue.