It means we don't know what they are doing.
And really we don't but to me it suggests an attempt to look behind the curtain marked "Management Only" ~ which they cannot do as it is passworded.
None of those five guests are on the banned list, their IP addresses indicated that 2 came from one related source and the other three seem to have been from a different source but again related. This suggests that the guests were all automated "bots" searching the site, as happens many times a day, gathering information of use to the advertisers. Your details are safe as they cannot access them, they can only read the posts.
Frankly I would stop looking at what others are doing if it worries you ~ that's what I am here for.