if the forum will not want to handle reported post which already 6 months old, why we can still submit a report or what is a valid reason we can report an old post?
From what I understand, its not that moderators won't handle all reports for posts made more than 6 months ago, but only in cases mentioned in that message so for example if you want to report old post that has malware link, they will act on that.
I have to say that this new update definitely makes sense as I see no much purpose in reporting years old posts for trivial reasons like thread bumping or consecutive posting other than stat padding. This way moderators will have more time to handle reports of the recent posts that actually affect us on the daily basis.