AFAIK, Apparently you can have the same post count and activity count without really waiting for 14 days to gain 14 counts of activities, just simply by having at least 1 hour or more interval with your post since you create your account.
This is not true, the interval between your posts and activity does not matter. You are eligible to 14 activity points within a 2 week period, if you make at least 1 post during that period. You get the whole 14 points if you make 14 or more posts.
Once you spammed and posted within 1hr, there's a huge chance that the mods might skip the other post thus counting only on the most recent one.
The mods do not manually count posts and update activity, it's an automatic process. Also, such a task is not feasible with the number of accounts and workload on the moderators already.