UPDATE!!! White Sands Footprints 2: The Quickening - New Dates and Methods on a 22,000 Year-Old Site

We got what I asked for quicker than expected! The team working on the White Sands site in New Mexico have provided dates based on terrestrial pollen as well as Optically Stimulated Luminescence (OSL) methods to refute the claim that the original dates were distorted by the reservoir effect.

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Previous Relevant Content
My first White Sands video:    • 23,000 year old Footprints in White S...  
On how carbon dating works:    • Radiocarbon Dating: Archaeology 101  

Abstract:
Human footprints at White Sands National Park, New Mexico, USA, reportedly date to between ~23,000 and 21,000 years ago according to radiocarbon dating of seeds from the aquatic plant Ruppia cirrhosa. These ages remain controversial because of potential old carbon reservoir effects that could compromise their accuracy. We present new calibrated 14C ages of terrestrial pollen collected from the same stratigraphic horizons as those of the Ruppia seeds, along with optically stimulated luminescence ages of sediments from within the human footprint–bearing sequence, to evaluate the veracity of the seed ages. The results show that the chronologic framework originally established for the White Sands footprints is robust and reaffirm that humans were present in North America during the Last Glacial Maximum.