In the specific case you linked, there was an answer posted 3 days ago, which has been deleted. You can see this on the question timeline or simply by clicking on the last activity. However, it is shown only if you can see deleted posts (which is privilege of 10k+ users and moderators). See also: Last activity on question shows modified by user who did not ...


The reason you don't see it is that the activity (specifically, the answer) is deleted and you don't have the sufficient reputation. The user activity log will not show anything that was deleted anyway. So when you see something like that, you can always assume that this is something that got deleted. (Specifically in the linked question's case, the user ...


Here's your answer (it seems to be a style file may have gotten mixed up?).

Only top voted, non community-wiki answers of a minimum length are eligible