Skeptics can make similar arguments about any book of the Bible to try to demonstrate why it is not inspired. Prots only selectively do it to the deuterocanonicals. Agnostics do it to other books.
The bottom line is that the Prots have no basis for accepting the other books in their Bible as inspired except for the authority of the Catholic Church. These guys are trying to reinvent the wheel.
I know Mark Shea is a Neo-Cath, but he has a great book on this called "By What Authority". This issue is what converted him from Prot to Catholic.