It's true.
I don't doubt your data -- but...
Although Gault (see http://www.texasbeyondhistory.net/gault/index.html) here in Texas is one of the more (the most?) productive Clovis sites anywhere, somehow, I find that I've been "sidetracked" by events (and the plenitude of historic sites in NE TX) into near 100% concentration on historic archaeology of late. I'm still wondering how this lithic technologist gradually wound up immersed in GPS/satellite-mapping pioneer wagon trails, homesites, etc... :-}
Consequently, I've lost track of recent thinking on subjects like Clovis, etc. Fortunately, Texas resident geomorphologist/archaeologist and Clovis expert, (and now owner of much of Gault) Dr. Michael B. Collins, is a really nice guy and friend. You've just reminded me that I should contact Mike and find out what is currently going on in the Clovis (and ?pre-? Clovis) world.
When I catch Mike in his office at TARL, I'll also ask him if the soils in the Clovis horizon at Gault have been examined for the evidence mentioned in the article.