Good point. The confusion abides.
If there is an unescorted Carrier (meaning a Carrier alone in the combat without an Escort marker), it is sunk on a roll of 5 or less, and goes to TRALA on a roll of 6 or more.
I'm thinking 6/6 (second sentence) should read "A die roll of 6-7 indicates damage to these 'notional' escorts..." etc. Does that make sense?