Incorrect.

Every day for 30 days I believe(might be wrong) you can get a possible 5 points, 1 for visiting and 4 for posting. Let's say you visit every day and post at least 4 times every day, you'd have 150/150 points, or 100% activity. Let's say you missed a day of visiting/posting, you'd have 145/150 points, or 97% activity(rounded up from 96.66%)

So basically, you'd just have to go for 30 days without visiting before you'd have 0 activity.