That's why some users here always given advice that we should not post in hold threads to avoid bump, this is my little explanation for you Mate you can check on other's members reply for more clarification.
You can post if you see your post is necessary for discussion in that thread. If your post is helpful to help OP or the discussion, why do you think you need to hold your post just for avoiding bump.
For spammers they don't care about their posts, the thread discussion or bump, they only write their spam posts and leave.