well, this is just speculation and it should be avoided at any cost since its already possibile buy these stamps in legit shop at facial value. plus they can't ship now since they are selling stuff that doesn't have on their hands
It was much more interesting if some one has already use these stamps for "real postage".
collectors normally are crazy for these kind of stuffs. Likewise this italian stamp emitted initially on October 2007 , but postponed to December 2007 few hours after being available in post office:
E.G https://www.ilcollezionistafilatelico.it/bustasingola_mysql.asp?idprodotto=7236
An "Early Date Cancellation" it's absolutely interesting to have in a collection