We are struggling with some blacklist notifications. When I receive the notifications from Marketo, I am pointed to this article, Simple Blacklist Remediation. Now, if Activity History is only tracked for 90 days, how does the use of these filters with the constraint date of "in past 6 months" actually work? It seems like all of the suggested inactivity filters should be set to 3 months since that is the length of activity history. What am I missing?