Bill, NG3K, who is behind the invaluable ADXO website informs DX-World readers:

For those of you who use my CQWW DX SSB announced operations list, I’ve done something a little different this year. I have harvested operations from ADXO which have announced to be QRV during the contest period, but not specifically for the contest, and included them in the SSB list. They are indicated by an asterisk (*) immediately following the callsign. In the table version of CQWW DX SSB announced operations there’s also a note in the information field explaining this, but in the ASCII version that note is truncated, so the only indication of the difference there is the asterisk following the callsign.