The CBI DNA summary says the same thing.
IF the minor component of the samples analyzed comes from one person, then the Ramseys are eliminated,
IF the minor component is made up of DNA contributions from more than one person, the Ramseys are not eliminated. The CBI report did not eliminate the Ramseys unilaterally, under all circumstances.
Look at a portion of the report again.
http://s92053900.onlinehome.us/cbi_closeup.gif
See the WB on the first line? That belongs to the unidentified DNA present in the underwear. To the left of that position, though, is an empty space where a foreign marker was missing. Look on the line below. There is a WB on the right, and another WB to its left. Look at the third line below. There is a WB to the right, to its left another WB, and to that one's left a WA. If the samples belong to two or more people, the first line's WB may, if it were filled in, have a WA to its left, in which case the first and second lines of DNA markers would identify two different people. You could have this potential array, using only what we can see:
WB WA WB (in the underwear)
WB WB WB (under JonBenet's left-hand nails)
WA WB WB (under JonBenet's right-hand nails)
If any or all of the Ramseys have a WB in that third position, they would not be eliminated, but only it could be completely ascertained as to what the contents of the missing positions are.