USMLE is not the gold standard. When a real patient begins to desat in the OR, no one hands you a piece of paper stating, this is happening because of a)....b)....c)...etc. There is no gold standard for resident selection, and this person is clearly an atypical case.
USMLE is a licensing exam and its creators did not intend for it to be used in resident selection. Virtually every other profession uses licensing exams as pass/fail mechanisms to answer one and only one question: does this person meet a threshold that weeds out those with a degree but questionable competence. That's why failing a USMLE is a big red flag. However, it does not mean that someone with a 230 is undoubtedly superior to someone with a 210. If that were the case, the best doctors would be those who did nothing but illegally snort crushed pills and stare at Q-bank for 2 years in their pajamas.
The OP will probably find a good program at which to match. However, a greater hurdle than the 210 is convincing a program that you can perform again as an intern, having done nothing clinical in five years. Additionally, some may be turned off by a person who took a coveted spot at Harvard or Hopkins only to leave medicine at graduation. I still think that you will find a good program, just cast a large net and have good answers for sceptical PD's.