The post counts, but it looks like the comment thread didn't quite meet the minimum before the deadline; the qualifying final comment came on the third of March. For future reference, the minimum of eight comments from your character (or three in logs) must all be posted within the month the activity check is covering.

I am, however, going to mark him as safe, as it's taken me a few days to get back to you, and this is your first month in game.