Where did you get that range from? Anatomically modern humans are generally considered to predate at least 200kya and most of the synthetic literature I've read

Where did you get that range from? Anatomically modern humans are generally considered to predate at least 200kya and most of the synthetic literature I've read considers speech likely in archaic humans (otherwise a huge, unwieldy tongue doesn't make much sense). It's also pretty hard to get morphology timelines as restricted as 40k years, especially with soft tissues and the inherent preservation issues.