Indeed, Luo Mang had revealed in the Diary that he was the one who had killed the Fourth Raikage and Killer B, and that he had killed them from a distance.
Even if he wanted to hide it, he could not really keep it hidden. Better to write it in the Diary with a purpose in mind.
Of course, he had his reasons for writing it down.
He trusted that the people reading it were no fools. They could probably piece most of it together and suspect that he had been the one to act.
But they could not be certain. What if some of the Diary holders heard the rumors from Konoha, combined them with what they knew, and started harboring malicious intentions?
Although he did not want too many people to know about his abilities, playing weak for too long could turn him into someone genuinely weak. Too much trouble was never good. It could easily eat into his time for dates and hanging out with friends.
A simple explanation would let the Diary holders understand, become wary, and exercise caution. At least they would not act recklessly.
Knowing that he could act without knowing his actual methods was enough. That alone would keep them in check.
"That should be enough of a reveal."
Luo Mang looked at the contents of the Diary and muttered to himself. He thought he had handled the reveal quite well, clearly getting three points across.
He had brought up the threat of aliens again.
Hiruzen Sarutobi was dead, and he had given his assessment of Hiruzen Sarutobi.
And he had revealed something about his own methods.
"Uchiha Itachi? Better not mention him."
Luo Mang fell silent and did not write in the Diary about why Uchiha Itachi had appeared in the mountains