Over the years we have seen a lot of spammers.
One of their preferred approaches are to comment on open topics - even though the topic is long dead - referred to as necro bumping and frowned upon.
Posting in old threads, or “necrobumping” is generally discouraged in the technical issue subforums, since it can potentially create disjointed “zombie” information; outdated posts with data which is no longer relevant due to Manjaro’s rolling nature, combined with more recent posts reflecting more current circumstance.
– Forum Rules - Manjaro
To avoid such thing - threads that is marked with a solution - closes in three days.
That is how it is - some oppose to it - it should stay open forever if no solution - but that is a bad idea with a rolling release - if they were to stay open forever - then updates to the software in question may have solved it in the meantime - and thus the topic becomes irrelevant.
Which is why it autocloses when a solution is provided.
As for your specific topic see my comment - Cannot update, everything fails to satisfy dependencies - #14 by linux-aarhus on why you need to remove a custom package interfering with your sync.