Sorry -- I don't see this as a consequence of Allen's explaining it.
Allen cannot speak for all YEC advocates.
The question might be a proper one to ICR.
If I were a YECer I'd simply say the stuff was created at the beginning
that way. Pretty much the Gosse approach.
(I have a difficulty here because I really don't think "science," or --
more properly -- "scientific data" supports a young earth. If God really
created the earth 6000 or so years ago -- He must have created it to
appear older than that. Why would he do that? I have no idea. The
"deceitful God" hypothesis is clearly ruled out -- but there may well
have been other reasons.
Burgy