Please, please help!

My wife just became Delta Platinum Medallion for the first time this January 2003. The following is what I remember reading about Platinum benefits at the Delta Web site last year, (The Page has now been changed for 2003/2004):

For Platinum Award Travel, if there is a seat on the plane, you can use your miles and acquire it using an award ticket for domestic or international travel. (No capacity restrictions.)

A Delta Agent has just told me my understanding is incorrect. The Delta agent told me the perk is that Delta will SELL you a domestic ticket on any flight, regardless of whether it was sold out.

Was I misreading the benefit statement?

Thanks. Thanks. Thanks.

Scott123