NO, this is not the reason you will not get the green card through marriage to a DV lottery winner. An after acquired spouse CAN benefit from a spouse's winning the lottery as long as 1. the marriage is BONA FIDE and VALID (I think the original poster may have also emailed me on this, in which case you already have my response) AND 2. the spouse trying to qualify for the green card through marriage to the DV lottery winner must be in the US LAWFULLY so that she CAN apply for adjustment of status. If you are in the US but are out of status, you are not eligible to submit the AOS application.
Please let me know if you have any additional questions or how I can be of further assistance to you in this matter.
Admitted in CA, AZ, IN and OH
Admitted to practice in CA, AZ, IN and OH