I would not assume they did because of that.
From the little experience I have with forums (I used to be on many forums before they got extinct), if the members do not post, then there is less reason to check in because there is no traffic. The problem is compounded if there aren't many members.
Take this forum for example. Some, but not all the traffic consists of people that only come here when they have an issue with their motorcycle. Some are one timer. Once their issue has received a reply, they leave. Other forumers post trivia so when members check-in, there is something they may want to read, or not. But it keeps the forum live.
Such as posting about trips, or places, stuff. Try to gather attention so your forum is not a dead beat place. It is not easy. Nowadays, people do not like to write, they would rather watch a video,
I am going for a ride today, so I don't have time to check your site. But I will later.