What
@shtumpa said is very good, try to argue that it is an unfair policy that punishes you twice (borderline on double jeopardy in legal term or unusual and cruel punishment) if they were to refuse to certify you for graduation. The first punishment is that you are in danger of being unranked by programs for having no CS ready for them and if they refuse to certify you, they punish you again for making sure not only you will not match but you will also not able to access the soap. This is really unfair.
The other argument is that the NRMP actually cautions the school to be very careful to withdraw students from the match if there are reasons to believe the students can graduate on-time. It is actually said so in the NRMP manual to medical schools.
Also, this can be a good argument: Research from the all the programs that you have interviewed website whether they will require a CS pass by ROL or not. If they don't need the CS, print them out and bring them with you to the appeal to say that you have reasonable chances for match success. The more schools that don't require the CS, the better. It will be so heartless if your school actively works to throw you out of the match.
Note: Do not call programs to inquire! You don't want to remind them you have a blank on CS period.
Lastly, you should also make this argument too: while it is true that the NRMP requires the school to certify whether senior students will graduate on-time, the NRMP's definition of on-time is before
July 1st. From the USMLE website, there are theoretically 2 more reporting periods before July 1st. So, for your school to forced withdraw you is very unseemly.
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Also, what is your school doing? It is insane for an American school! Forced withdraw a student for having no CS by Feb 28th?!? My friend, a 4th-year, just did his CS January, his CS result will only come out in March! The school did not even bat an eyelash over it. He, however, is cussing himself for his procrastination. If he failed, he will be in a pickle to try to have the result by July 1st.