That number is based on this year's acceptance. Supposedly, approximately 15 of the 19 should get in. In the past, a higher percentage of SMP students were accepted to EVMS. However, those percentages are also based on lower class sizes and lower numbers of students actually completing the SMP program. (Apparently, this is the first year where all of the students graduated.)
If you plan to use the SMP program to apply to MD schools other than EVMS, you probably wouldn't be applying the year you do the program because the grades will not be able to be admitted to AMCAS since AMCAS is due before you will get your fall grades. The schools you apply to will still be judging you on your previous grades, MCATs, recs, etc. So while you can apply to MD schools the year you do your SMP, you should have back-up plans. It seems that your two back-ups (if you don't get into EVMS) are basically:
1. Apply to DO schools the year you're doing the SMP program.
2. Apply to MD schools the year you're doing the SMP program, BUT plan to reapply the next year (or just wait to apply) and have something to do after you graduate from the SMP - get your AMCAS started, have a job lined up, have some activities lined up. It would be AWFUL if you were counting on an acceptance and all you did all summer long after you finished was wait to hear from EVMS and you never got in.
Good luck!