How to edit post with API without bumping topic?

Thanks for the reply, but I’m afraid this makes no sense. As soon as I edit the post it has already been bumped. So I am sorry, but I don’t understand how this would help me.

Do I reset the bump date once and all consecutive edits won’t bump the topic? The explanation in the link is rather vague. When do I reset the bump date? Before? After? If the latter, I still don’t understand. At that time the topc already got bumped.