You missunderstood something. It is "only the SBD or Steem backed dollar that is supposed to be stable cryptocurrency pegged to the U.S. dollar." Not STEEM. Go read that article again if you don't believe me

STEEM is a free non pegged currency that could hit 10, 20, even 50$ in the future if STEEM becomes mainstream. More users on a lower amount of floating currency = higher price of STEEM. Right now the early adopters are selling faster than the new people buy the flaoting STEEM.