No, Bob, the Dead Sea isn't ANYWHERE NEAR salty enough!
They're talking ulta-brines - acidic KCl/NaCl/BrCl brines, with a VERY large dose of H2SO4 - Sulphuric Acid.
A few volcanic craters on earth come close - the sort that dissolve rubber boats before you can paddle across...
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VCS-40D61GG-X&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=3019dc32031a09a9f8a214f5234d5256
The Dead Sea is merely biologically "dead". You can even swim in it (or ON it, due to its significant density). It isn't actually posonous and corrosive...