He/she will get the right answer on ROL day when he/she gets an email from NRMp stating that they have been withdrawn.
Here is from FAQs for Independent Aplicants:
http://www.nrmp.org/res_match/faq/ind_apps_faq.html#7
I am a foreign medical school graduate. If I have not received my ECFMG® Certification when the rank order list opens can I still enter my rank order list?
Yes, you can. If the NRMP receives notification from ECFMG® that you have completed your exam requirements for certification by the rank order list deadline, you will be included in the Match. If we have not received ECFMG® confirmation, NRMP will withdraw you from the match shortly after the rank order list deadline and your rank order list will NOT be used in the match. You will receive an e-mail notification from the NRMP if this occurs.
................................
Here is a page from NRMP for Independent applicants (including IMGs). Please look at paragraph : "Students or graduates of international medical schools who are not confirmed by ECFMG® as having passed all examinations necessary for ECFMG certification will be withdrawn automatically by the NRMP."
http://www.nrmp.org/res_match/special_part/ind_app/withdraw_new.html
Reasons Why NRMP May Withdraw Applicants from the NRMP
Applicants who participate in both the Canadian Resident Matching Service (CaRMS) and the NRMP are expected to accept a position if matched into a Canadian program. Applicants may register for both the CaRMS and the NRMP. In those years in which CaRMS has an earlier schedule than the NRMP, individuals who match through CaRMS will automatically be ineligible to match to concurrent NRMP positions.
Applicants who participate in the American Osteopathic Association (AOA) Match are prohibited from participating in the NRMP Match for concurrent NRMP positions. The earlier schedule of the AOA Match allows applicants to compete for an osteopathic position and, if unsuccessful, continue to participate in the NRMP. The AOA informs the NRMP of the dual participants who have matched into an osteopathic program, and those individuals are withdrawn automatically from the NRMP Match for concurrent year PGY-1 and PGY-2 positions.
Applicants receiving positions in the Military Match will be withdrawn from the NRMP Match based on information forwarded by their service to the NRMP.
Applicants who obtained advanced positions (PGY-2) to begin in the current Match year either in the NRMP Specialties Matching Service or the previous year's NRMP Match must receive a waiver of their match commitment in order to participate in the current year's Match. The applicant will be withdrawn automatically from the Match if a waiver is not granted by the NRMP.
Students or graduates of international medical schools who are not confirmed by ECFMG® as having passed all examinations necessary for ECFMG certification will be withdrawn automatically by the NRMP.
Fifth Pathway program students or graduates not confirmed by ECFMG as having passed the USMLE Step 1 and Step 2 (or their equivalents) will be withdrawn automatically by the NRMP.
Applicants whose attendance or graduation from a Canadian, osteopathic, or Fifth Pathway program is not confirmed by their institutions will be withdrawn automatically by the NRMP.
Applicants whose graduation from a U.S. medical school is not verified by their institutions will be withdrawn automatically by the NRMP.
Applicants with unpaid fees for any services provided by the NRMP will be withdrawn automatically.
Updated 09/28/2006