It sounds untruthful to me, the way you explain how the perpetrator "accessed your PMs, etc." as if that'd be surprising at all if your account had been compromised. Either way, why post any of this if nobody was in fact scammed under your account. It's not necessary, and surely will make some users hesitant to deal with you in the future. You should have just changed your information, closed your thread, and moved on and dealt with it personally. Just my input.
I don't think it was unnecessary like you mentioned..! it is very necessary for those who take their security for guaranteed , you never know who's might be stalking you and trying to make hacking attempts ..!