I'm a little confused now, how does "Archival" board even has the 0.76 merits per post ratio?

Moderator move a thread to archival when it doesn't have any value in any other boards. when they move a thread it also move all other data like merits, posts although these merits isn't given in archival they still count as archival boards merit.
I'm a little confused now, how does "Archival" board even has the 0.76 merits per post ratio?

People can move posts into Archive when they are irrelevant/wrong/finished/tested, etc. but the posts can still be merited while they are live.

Thanks, May months merit count increased in Archival mostly because of this post

Its an interesting way to display the data, because it shows that Full Members are the most likely to give merits to their own rank. Every rank likes giving merits to Legendaries proportionately more than the others, or sometimes even their own.
Over 60% of Legendary merits go to other Legendaries, but they still give away more than twice as many merits to the other ranks than all other ranks combined.
I also found the data list interesting. DdmrDdmr is a genius for creating a dataset like this.