LSAC has a policy of including all credits that you have before getting your degree. Harvard, like all schools, gets the credit information from LSAC. It is possible to game the system a bit that way, but it is harder than it would be if they allowed you to only count your degree GPA because then you could just drop any credits you wanted and have it not count.
Of course, LSAC does have to find out in order to demand it from you. But if they do find a record of your attendance and realize that you haven’t reported it, they will not allow you to complete your applications until you report it. As an example, I know someone who had Mir mentioned on his transcript from another yeshiva which gave him his degree and LSAC would not process his applications until he got a transcript from Mir Jerusalem.
Congratulations on your good score. You must be very smart.
I was not the one who said that the guy was a slacker; that was the impression that the questioner gave by thinking it so odd that this fellow could get into HLS. Otherwise, the question is not so confusing. He was a brilliant, serious guy, and when he decided to leave yeshiva, his brilliance and seriousness paid off in his application to HLS.