I'm thinking that moderators want to be notified about duplicate posts because of the confusion they cause and to merge replies into one thread. I was about to use the "Report Post" icon to make such a notification, but did not when I read "Note: This is ONLY to be used to report spam, advertising messages, and problematic (harassment, fighting, or rude) posts." My suggestion would be to add "Duplicate Post" to that statement, if such notification is desired by the mods.
There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2008 Chevy Duramax; Pullrite Superglide Hitch