Even if Runner Felice knew about this in September, no race director is going to risk the negative press and effort to call out some random 3:11. runner. The most they would do if they found out the guy cheated is probably add a mat somewhere to the race in hopes that it doesn't happen again and no one finds out. I have set up races in the past, the last thing you want to deal with after a race has been finished is alert people that the results need to be amended. People will come out of the wood work to get an age group medal.
Now that the case has gained national attention, it makes sense for Runner Felice to alert people to what he knows. If he came on here in September saying a 3:11 guy cheated, 99% of Letsrun would say, who cares, he did not get any prize money, get a life, get a job. Instead he helped spark a great 89 page letsrun thread.
Yes I have met Runner Felice many times, so I may be bias, but he definitely does not need letsrun attention to feel successful in life.