just my hapence: I found the Abarbanel that the mechaber is quoting here:
http://hebrewbooks.org/pdfpager.aspx?req=5306&st=&pgnum=216
Personally I find it more difficult to say that the Shomer Emunim and Abarbanel could be making such a mistake. As you say, his position is so opposing that one would expect they would have done adequate research before making such a pronouncement.