Yes, it seems he did that for signature weekly stake, as you can read their manager said about min 10 post/week,
Hi, thanks for your interest!
1: 10 posts per week
2: Posts in sub-forums where the signature is not active do not count. The local, gambling, and service sub-forums do not count - exceptions can be made by the bounty manager.
We can also search his name on bounty spreadsheet
https://docs.google.com/spreadsheets/d/1NuQm3prE2OiKQI1w980d5R8QXGweznudP-VHfAL7Pf4/edit#gid=0 and from that, we can see he was completed week 3 (Oct 12-18) but in fact, when we see his post history, there are only 4 posts (he has deleted 6 posts and then will re-post those 6 post to fullfill the min post on this week)