To my knowledge, Audacity has never removed any of the features/filters it had, only added to them. If it was in there "way back when" it should still be in there now.
My guess is that Audacity simply "reflects" the entire track to pull off that trick.
Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134
A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
~ Saul Bellow, To Jerusalem and Back